[Fire TV Q&A, Help & Troubleshooting] Matt_7:
OK, I connected the FireTV to Ubuntu and here is what I got:

To run a command as administrator (user "root"), use "sudo <command>".

See "man sudo_root" for details.

ubuntu@ubuntu:~/Desktop/To FireTV$ df -h

Filesystem Size Used Avail Use% Mounted on

udev 3.8G 0 3.8G 0% /dev

tmpfs 782M 2.0M 780M 1% /run

/dev/sda1 7.6G 2.4G 5.2G 32% /cdrom

/dev/loop0 1.9G 1.9G 0 100% /rofs

/cow 3.9G 849M 3.0G 22% /

tmpfs 3.9G 0 3.9G 0% /dev/shm

tmpfs 5.0M 4.0K 5.0M 1% /run/lock

tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup

tmpfs 3.9G 0 3.9G 0% /tmp

tmpfs 782M 68K 782M 1% /run/user/999

/dev/loop1 89M 89M 0 100% /snap/core/7270

/dev/loop2 55M 55M 0 100% /snap/core18/1066

/dev/loop3 43M 43M 0 100% /snap/gtk-common-themes/1313

/dev/loop4 150M 150M 0 100% /snap/gnome-3-28-1804/67

/dev/loop5 4.2M 4.2M 0 100% /snap/gnome-calculator/406

/dev/loop6 15M 15M 0 100% /snap/gnome-characters/296

/dev/loop7 1.0M 1.0M 0 100% /snap/gnome-logs/61

/dev/loop8 3.8M 3.8M 0 100% /snap/gnome-system-monitor/100

/dev/sdb2 3.9M 1.4M 2.4M 36% /media/ubuntu/57f8f4bc-abf4-655f-bf67-946fc0f9f25b1

ubuntu@ubuntu:~/Desktop/To FireTV$ mount

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)

proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)

udev on /dev type devtmpfs (rw,nosuid,relatime,size=3977092k,nr_inodes=994273,mode=755)

devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)

tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=800368k,mode=755)

/dev/sda1 on /cdrom type vfat (ro,noatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)

/dev/loop0 on /rofs type squashfs (ro,noatime)

/cow on / type overlay (rw,relatime,lowerdir=//filesystem.squashfs,upperdir=/cow/upper,workdir=/cow/work)

securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)

tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)

tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)

tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)

cgroup on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)

cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)

pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)

efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)

cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)

cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)

cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)

cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)

cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)

cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)

cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)

cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)

cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)

cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)

cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)

systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=24,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16291)

hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)

debugfs on /sys/kernel/debug type debugfs (rw,relatime)

mqueue on /dev/mqueue type mqueue (rw,relatime)

tracefs on /sys/kernel/debug/tracing type tracefs (rw,relatime)

configfs on /sys/kernel/config type configfs (rw,relatime)

fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)

tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime)

tmpfs on /run/user/999 type tmpfs (rw,nosuid,nodev,relatime,size=800368k,mode=700,uid=999,gid=999)

gvfsd-fuse on /run/user/999/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=999,group_id=999)

/var/lib/snapd/snaps/core_7270.snap on /snap/core/7270 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/core18_1066.snap on /snap/core18/1066 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gtk-common-themes_1313.snap on /snap/gtk-common-themes/1313 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gnome-3-28-1804_67.snap on /snap/gnome-3-28-1804/67 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gnome-calculator_406.snap on /snap/gnome-calculator/406 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gnome-characters_296.snap on /snap/gnome-characters/296 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gnome-logs_61.snap on /snap/gnome-logs/61 type squashfs (ro,nodev,relatime,x-gdu.hide)

/var/lib/snapd/snaps/gnome-system-monitor_100.snap on /snap/gnome-system-monitor/100 type squashfs (ro,nodev,relatime,x-gdu.hide)

/dev/sdb2 on /media/ubuntu/57f8f4bc-abf4-655f-bf67-946fc0f9f25b1 type ext4 (ro,nosuid,nodev,relatime,uhelper=udisks2)

ubuntu@ubuntu:~/Desktop/To FireTV$

So nothing to unmount, right?