[Shield Android TV Q&A, Help & Troubleshooting] NiHaoMike:
I tried to install Busybox by switching adb to root and then running the install script, but despite the remount working, the install fails with "read only file system".

mike@DX79SI ~/bulk/downloads/busybox-android-master $ adb root
mike@DX79SI ~/bulk/downloads/busybox-android-master $ ./android-install.sh
remount succeeded
/dev/block/platform/sdhci-tegra.3/by-name/APP /system ext4 rw,seclabel,noatime,data=ordered 0 0
7022 KB/s (1937480 bytes in 0.269s)
8 KB/s (374 bytes in 0.044s)
su
/system/xbin/busybox ash /sdcard/android-remote-install.sh
rm /sdcard/android-remote-install.sh
sync
exit
exit

root@foster:/ # su
/system/xbin/busybox ash /sdcard/android-remote-install.sh
rm /sdcard/android-remote-install.sh
sync
exit
exit

/system/xbin/busybox ash /sdcard/android-remote-install.sh
rm /sdcard/android-remote-install.sh
sync
exit
exit

root@foster:/ # /system/xbin/busybox ash /sdcard/android-remote-install.sh
ln: /system/bin/[: Read-only file system
ln: /system/bin/[[: Read-only file system
ln: /system/bin/acpid: Read-only file system
ln: /system/bin/add-shell: Read-only file system
ln: /system/bin/addgroup: Read-only file system
ln: /system/bin/adduser: Read-only file system
ln: /system/bin/adjtimex: Read-only file system
ln: /system/bin/ar: Read-only file system
ln: /system/bin/arp: Read-only file system
ln: /system/bin/arping: Read-only file system
ln: /system/bin/ash: Read-only file system
ln: /system/bin/awk: Read-only file system
ln: /system/bin/base64: Read-only file system
ln: /system/bin/basename: Read-only file system
ln: /system/bin/bash: Read-only file system
ln: /system/bin/beep: Read-only file system
rm: can't remove '/system/bin/blkid': Read-only file system
ln: /system/bin/blkid: File exists
ln: /system/bin/blockdev: Read-only file system
ln: /system/bin/bootchartd: Read-only file system
ln: /system/bin/brctl: Read-only file system
ln: /system/bin/bunzip2: Read-only file system
ln: /system/bin/bzcat: Read-only file system
ln: /system/bin/bzip2: Read-only file system
ln: /system/bin/cal: Read-only file system
rm: can't remove '/system/bin/cat': Read-only file system
ln: /system/bin/cat: File exists
ln: /system/bin/catv: Read-only file system
ln: /system/bin/chat: Read-only file system
ln: /system/bin/chattr: Read-only file system
ln: /system/bin/chgrp: Read-only file system
rm: can't remove '/system/bin/chmod': Read-only file system
ln: /system/bin/chmod: File exists
rm: can't remove '/system/bin/chown': Read-only file system
ln: /system/bin/chown: File exists
ln: /system/bin/chpasswd: Read-only file system
ln: /system/bin/chpst: Read-only file system
ln: /system/bin/chroot: Read-only file system
ln: /system/bin/chrt: Read-only file system
ln: /system/bin/chvt: Read-only file system
ln: /system/bin/cksum: Read-only file system
rm: can't remove '/system/bin/clear': Read-only file system
ln: /system/bin/clear: File exists
rm: can't remove '/system/bin/cmp': Read-only file system
ln: /system/bin/cmp: File exists
ln: /system/bin/comm: Read-only file system
rm: can't remove '/system/bin/cp': Read-only file system
ln: /system/bin/cp: File exists
ln: /system/bin/cpio: Read-only file system
ln: /system/bin/crond: Read-only file system
ln: /system/bin/crontab: Read-only file system
ln: /system/bin/cryptpw: Read-only file system
ln: /system/bin/cttyhack: Read-only file system
ln: /system/bin/cut: Read-only file system
rm: can't remove '/system/bin/date': Read-only file system
ln: /system/bin/date: File exists
ln: /system/bin/dc: Read-only file system
rm: can't remove '/system/bin/dd': Read-only file system
ln: /system/bin/dd: File exists
ln: /system/bin/deallocvt: Read-only file system
ln: /system/bin/delgroup: Read-only file system
ln: /system/bin/deluser: Read-only file system
ln: /system/bin/depmod: Read-only file system
ln: /system/bin/devmem: Read-only file system
rm: can't remove '/system/bin/df': Read-only file system
ln: /system/bin/df: File exists
ln: /system/bin/dhcprelay: Read-only file system
ln: /system/bin/diff: Read-only file system
ln: /system/bin/dirname: Read-only file system
rm: can't remove '/system/bin/dmesg': Read-only file system
ln: /system/bin/dmesg: File exists
ln: /system/bin/dnsd: Read-only file system
ln: /system/bin/dnsdomainname: Read-only file system
ln: /system/bin/dos2unix: Read-only file system
rm: can't remove '/system/bin/du': Read-only file system
ln: /system/bin/du: File exists
ln: /system/bin/dumpkmap: Read-only file system
ln: /system/bin/dumpleases: Read-only file system
ln: /system/bin/echo: Read-only file system
ln: /system/bin/ed: Read-only file system
ln: /system/bin/egrep: Read-only file system
ln: /system/bin/eject: Read-only file system
ln: /system/bin/env: Read-only file system
ln: /system/bin/envdir: Read-only file system
ln: /system/bin/envuidgid: Read-only file system
ln: /system/bin/ether-wake: Read-only file system
ln: /system/bin/expand: Read-only file system
ln: /system/bin/expr: Read-only file system
ln: /system/bin/fakeidentd: Read-only file system
ln: /system/bin/false: Read-only file system
ln: /system/bin/fbset: Read-only file system
ln: /system/bin/fbsplash: Read-only file system
ln: /system/bin/fdflush: Read-only file system
ln: /system/bin/fdformat: Read-only file system
ln: /system/bin/fdisk: Read-only file system
ln: /system/bin/fgconsole: Read-only file system
ln: /system/bin/fgrep: Read-only file system
ln: /system/bin/find: Read-only file system
ln: /system/bin/findfs: Read-only file system
ln: /system/bin/flock: Read-only file system
ln: /system/bin/fold: Read-only file system
ln: /system/bin/free: Read-only file system
ln: /system/bin/freeramdisk: Read-only file system
ln: /system/bin/fsck: Read-only file system
ln: /system/bin/fsck.minix: Read-only file system
ln: /system/bin/fstrim: Read-only file system
ln: /system/bin/fsync: Read-only file system
ln: /system/bin/ftpd: Read-only file system
ln: /system/bin/ftpget: Read-only file system
ln: /system/bin/ftpput: Read-only file system
ln: /system/bin/fuser: Read-only file system
ln: /system/bin/getopt: Read-only file system
ln: /system/bin/getty: Read-only file system
rm: can't remove '/system/bin/grep': Read-only file system
ln: /system/bin/grep: File exists
ln: /system/bin/groups: Read-only file system
ln: /system/bin/gunzip: Read-only file system
rm: can't remove '/system/bin/gzip': Read-only file system
ln: /system/bin/gzip: File exists
ln: /system/bin/halt: Read-only file system
rm: can't remove '/system/bin/hd': Read-only file system
ln: /system/bin/hd: File exists
ln: /system/bin/hdparm: Read-only file system
ln: /system/bin/head: Read-only file system
ln: /system/bin/hexdump: Read-only file system
ln: /system/bin/hostid: Read-only file system
ln: /system/bin/hostname: Read-only file system
ln: /system/bin/httpd: Read-only file system
ln: /system/bin/hwclock: Read-only file system
rm: can't remove '/system/bin/id': Read-only file system
ln: /system/bin/id: File exists
rm: can't remove '/system/bin/ifconfig': Read-only file system
ln: /system/bin/ifconfig: File exists
ln: /system/bin/ifdown: Read-only file system
ln: /system/bin/ifenslave: Read-only file system
ln: /system/bin/ifplugd: Read-only file system
ln: /system/bin/ifup: Read-only file system
ln: /system/bin/inetd: Read-only file system
ln: /system/bin/init: Read-only file system
rm: can't remove '/system/bin/insmod': Read-only file system
ln: /system/bin/insmod: File exists
ln: /system/bin/install: Read-only file system
rm: can't remove '/system/bin/ionice': Read-only file system
ln: /system/bin/ionice: File exists
ln: /system/bin/iostat: Read-only file system
rm: can't remove '/system/bin/ip': Read-only file system
ln: /system/bin/ip: File exists
ln: /system/bin/ipaddr: Read-only file system
ln: /system/bin/ipcalc: Read-only file system
ln: /system/bin/ipcrm: Read-only file system
ln: /system/bin/ipcs: Read-only file system
ln: /system/bin/iplink: Read-only file system
ln: /system/bin/iproute: Read-only file system
ln: /system/bin/iprule: Read-only file system
ln: /system/bin/iptunnel: Read-only file system
ln: /system/bin/kbd_mode: Read-only file system
rm: can't remove '/system/bin/kill': Read-only file system
ln: /system/bin/kill: File exists
ln: /system/bin/killall: Read-only file system
ln: /system/bin/killall5: Read-only file system
ln: /system/bin/klogd: Read-only file system
ln: /system/bin/last: Read-only file system
ln: /system/bin/less: Read-only file system
ln: /system/bin/linux32: Read-only file system
ln: /system/bin/linux64: Read-only file system
ln: /system/bin/linuxrc: Read-only file system
rm: can't remove '/system/bin/ln': Read-only file system
ln: /system/bin/ln: File exists
ln: /system/bin/loadfont: Read-only file system
ln: /system/bin/loadkmap: Read-only file system
ln: /system/bin/logger: Read-only file system
ln: /system/bin/login: Read-only file system
ln: /system/bin/logname: Read-only file system
ln: /system/bin/logread: Read-only file system
ln: /system/bin/losetup: Read-only file system
ln: /system/bin/lpd: Read-only file system
ln: /system/bin/lpq: Read-only file system
ln: /system/bin/lpr: Read-only file system
rm: can't remove '/system/bin/ls': Read-only file system
ln: /system/bin/ls: File exists
ln: /system/bin/lsattr: Read-only file system
rm: can't remove '/system/bin/lsmod': Read-only file system
ln: /system/bin/lsmod: File exists
rm: can't remove '/system/bin/lsof': Read-only file system
ln: /system/bin/lsof: File exists
ln: /system/bin/lspci: Read-only file system
ln: /system/bin/lsusb: Read-only file system
ln: /system/bin/lzcat: Read-only file system
ln: /system/bin/lzma: Read-only file system
ln: /system/bin/lzop: Read-only file system
ln: /system/bin/lzopcat: Read-only file system
ln: /system/bin/makedevs: Read-only file system
ln: /system/bin/makemime: Read-only file system
ln: /system/bin/man: Read-only file system
ln: /system/bin/md5sum: Read-only file system
ln: /system/bin/mdev: Read-only file system
ln: /system/bin/mesg: Read-only file system
ln: /system/bin/microcom: Read-only file system
rm: can't remove '/system/bin/mkdir': Read-only file system
ln: /system/bin/mkdir: File exists
ln: /system/bin/mkdosfs: Read-only file system
ln: /system/bin/mke2fs: Read-only file system
ln: /system/bin/mkfifo: Read-only file system
ln: /system/bin/mkfs.ext2: Read-only file system
ln: /system/bin/mkfs.minix: Read-only file system
ln: /system/bin/mkfs.vfat: Read-only file system
rm: can't remove '/system/bin/mknod': Read-only file system
ln: /system/bin/mknod: File exists
ln: /system/bin/mkpasswd: Read-only file system
rm: can't remove '/system/bin/mkswap': Read-only file system
ln: /system/bin/mkswap: File exists
ln: /system/bin/mktemp: Read-only file system
ln: /system/bin/modinfo: Read-only file system
ln: /system/bin/modprobe: Read-only file system
ln: /system/bin/more: Read-only file system
rm: can't remove '/system/bin/mount': Read-only file system
ln: /system/bin/mount: File exists
ln: /system/bin/mountpoint: Read-only file system
ln: /system/bin/mpstat: Read-only file system
ln: /system/bin/mt: Read-only file system
rm: can't remove '/system/bin/mv': Read-only file system
ln: /system/bin/mv: File exists
ln: /system/bin/nameif: Read-only file system
ln: /system/bin/nbd-client: Read-only file system
ln: /system/bin/nc: Read-only file system
rm: can't remove '/system/bin/netstat': Read-only file system
ln: /system/bin/netstat: File exists
ln: /system/bin/nice: Read-only file system
ln: /system/bin/nmeter: Read-only file system
rm: can't remove '/system/bin/nohup': Read-only file system
ln: /system/bin/nohup: File exists
ln: /system/bin/nslookup: Read-only file system
ln: /system/bin/ntpd: Read-only file system
ln: /system/bin/od: Read-only file system
ln: /system/bin/openvt: Read-only file system
ln: /system/bin/passwd: Read-only file system
ln: /system/bin/patch: Read-only file system
ln: /system/bin/pgrep: Read-only file system
ln: /system/bin/pidof: Read-only file system
rm: can't remove '/system/bin/ping': Read-only file system
ln: /system/bin/ping: File exists
rm: can't remove '/system/bin/ping6': Read-only file system
ln: /system/bin/ping6: File exists
ln: /system/bin/pipe_progress: Read-only file system
ln: /system/bin/pivot_root: Read-only file system
ln: /system/bin/pkill: Read-only file system
ln: /system/bin/pmap: Read-only file system
ln: /system/bin/popmaildir: Read-only file system
ln: /system/bin/poweroff: Read-only file system
ln: /system/bin/powertop: Read-only file system
rm: can't remove '/system/bin/printenv': Read-only file system
ln: /system/bin/printenv: File exists
ln: /system/bin/printf: Read-only file system
rm: can't remove '/system/bin/ps': Read-only file system
ln: /system/bin/ps: File exists
ln: /system/bin/pscan: Read-only file system
ln: /system/bin/pstree: Read-only file system
ln: /system/bin/pwd: Read-only file system
ln: /system/bin/pwdx: Read-only file system
ln: /system/bin/raidautorun: Read-only file system
ln: /system/bin/rdate: Read-only file system
ln: /system/bin/rdev: Read-only file system
ln: /system/bin/readahead: Read-only file system
rm: can't remove '/system/bin/readlink': Read-only file system
ln: /system/bin/readlink: File exists
ln: /system/bin/readprofile: Read-only file system
ln: /system/bin/realpath: Read-only file system
ln: /system/bin/reformime: Read-only file system
ln: /system/bin/remove-shell: Read-only file system
rm: can't remove '/system/bin/renice': Read-only file system
ln: /system/bin/renice: File exists
ln: /system/bin/reset: Read-only file system
ln: /system/bin/resize: Read-only file system
ln: /system/bin/rev: Read-only file system
ln: /system/bin/rfkill: Read-only file system
rm: can't remove '/system/bin/rm': Read-only file system
ln: /system/bin/rm: File exists
rm: can't remove '/system/bin/rmdir': Read-only file system
ln: /system/bin/rmdir: File exists
rm: can't remove '/system/bin/rmmod': Read-only file system
ln: /system/bin/rmmod: File exists
rm: can't remove '/system/bin/route': Read-only file system
ln: /system/bin/route: File exists
ln: /system/bin/rpm: Read-only file system
ln: /system/bin/rpm2cpio: Read-only file system
ln: /system/bin/rtcwake: Read-only file system
ln: /system/bin/run-parts: Read-only file system
ln: /system/bin/runlevel: Read-only file system
ln: /system/bin/runsv: Read-only file system
ln: /system/bin/runsvdir: Read-only file system
ln: /system/bin/rx: Read-only file system
ln: /system/bin/script: Read-only file system
ln: /system/bin/scriptreplay: Read-only file system
ln: /system/bin/sed: Read-only file system
ln: /system/bin/sendmail: Read-only file system
ln: /system/bin/seq: Read-only file system
ln: /system/bin/setarch: Read-only file system
ln: /system/bin/setconsole: Read-only file system
ln: /system/bin/setfont: Read-only file system
ln: /system/bin/setkeycodes: Read-only file system
ln: /system/bin/setlogcons: Read-only file system
ln: /system/bin/setserial: Read-only file system
ln: /system/bin/setsid: Read-only file system
ln: /system/bin/setuidgid: Read-only file system
rm: can't remove '/system/bin/sh': Read-only file system
ln: /system/bin/sh: File exists
ln: /system/bin/sha1sum: Read-only file system
ln: /system/bin/sha256sum: Read-only file system
ln: /system/bin/sha3sum: Read-only file system
ln: /system/bin/sha512sum: Read-only file system
ln: /system/bin/showkey: Read-only file system
ln: /system/bin/slattach: Read-only file system
rm: can't remove '/system/bin/sleep': Read-only file system
ln: /system/bin/sleep: File exists
ln: /system/bin/smemcap: Read-only file system
ln: /system/bin/softlimit: Read-only file system
ln: /system/bin/sort: Read-only file system
ln: /system/bin/split: Read-only file system
ln: /system/bin/start-stop-daemon: Read-only file system
ln: /system/bin/stat: Read-only file system
ln: /system/bin/strings: Read-only file system
ln: /system/bin/stty: Read-only file system
ln: /system/bin/sulogin: Read-only file system
ln: /system/bin/sum: Read-only file system
ln: /system/bin/sv: Read-only file system
ln: /system/bin/svlogd: Read-only file system
rm: can't remove '/system/bin/swapoff': Read-only file system
ln: /system/bin/swapoff: File exists
rm: can't remove '/system/bin/swapon': Read-only file system
ln: /system/bin/swapon: File exists
ln: /system/bin/switch_root: Read-only file system
rm: can't remove '/system/bin/sync': Read-only file system
ln: /system/bin/sync: File exists
ln: /system/bin/sysctl: Read-only file system
ln: /system/bin/syslogd: Read-only file system
ln: /system/bin/tac: Read-only file system
ln: /system/bin/tail: Read-only file system
ln: /system/bin/tar: Read-only file system
ln: /system/bin/tcpsvd: Read-only file system
ln: /system/bin/tee: Read-only file system
ln: /system/bin/telnet: Read-only file system
ln: /system/bin/telnetd: Read-only file system
ln: /system/bin/test: Read-only file system
ln: /system/bin/tftp: Read-only file system
ln: /system/bin/tftpd: Read-only file system
ln: /system/bin/time: Read-only file system
ln: /system/bin/timeout: Read-only file system
rm: can't remove '/system/bin/top': Read-only file system
ln: /system/bin/top: File exists
rm: can't remove '/system/bin/touch': Read-only file system
ln: /system/bin/touch: File exists
ln: /system/bin/tr: Read-only file system
ln: /system/bin/traceroute: Read-only file system
ln: /system/bin/traceroute6: Read-only file system
ln: /system/bin/true: Read-only file system
ln: /system/bin/tty: Read-only file system
ln: /system/bin/ttysize: Read-only file system
ln: /system/bin/tunctl: Read-only file system
ln: /system/bin/tune2fs: Read-only file system
ln: /system/bin/udhcpc: Read-only file system
ln: /system/bin/udhcpd: Read-only file system
ln: /system/bin/udpsvd: Read-only file system
rm: can't remove '/system/bin/umount': Read-only file system
ln: /system/bin/umount: File exists
ln: /system/bin/uname: Read-only file system
ln: /system/bin/uncompress: Read-only file system
ln: /system/bin/unexpand: Read-only file system
ln: /system/bin/uniq: Read-only file system
ln: /system/bin/unix2dos: Read-only file system
ln: /system/bin/unlzma: Read-only file system
ln: /system/bin/unlzop: Read-only file system
ln: /system/bin/unxz: Read-only file system
ln: /system/bin/unzip: Read-only file system
rm: can't remove '/system/bin/uptime': Read-only file system
ln: /system/bin/uptime: File exists
ln: /system/bin/users: Read-only file system
ln: /system/bin/usleep: Read-only file system
ln: /system/bin/uudecode: Read-only file system
ln: /system/bin/uuencode: Read-only file system
ln: /system/bin/vconfig: Read-only file system
ln: /system/bin/vi: Read-only file system
ln: /system/bin/vlock: Read-only file system
ln: /system/bin/volname: Read-only file system
ln: /system/bin/wall: Read-only file system
ln: /system/bin/watch: Read-only file system
ln: /system/bin/watchdog: Read-only file system
ln: /system/bin/wc: Read-only file system
ln: /system/bin/wget: Read-only file system
ln: /system/bin/which: Read-only file system
ln: /system/bin/who: Read-only file system
ln: /system/bin/whoami: Read-only file system
ln: /system/bin/whois: Read-only file system
ln: /system/bin/xargs: Read-only file system
ln: /system/bin/xz: Read-only file system
ln: /system/bin/xzcat: Read-only file system
ln: /system/bin/yes: Read-only file system
ln: /system/bin/zcat: Read-only file system
ln: /system/bin/zcip: Read-only file system
1|root@foster:/ # rm /sdcard/android-remote-install.sh
root@foster:/ # sync
root@foster:/ # exit
root@foster:/ # exit