for example when I "sudo apt-get install libmemcache0", I got:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
libmemcache0 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "zh_CN.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
Setting up linux-image-2.6.24-16-xen (2.6.24-16.30) ...
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "zh_CN.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.24-16-xen
Could not find postinst hook script [update-grub].
Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'
dpkg: error processing linux-image-2.6.24-16-xen (--configure):
 subprocess post-installation script returned error exit status 2
Setting up linux-image-2.6.24-24-386 (2.6.24-24.61) ...
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "zh_CN.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.24-24-386
Could not find postinst hook script [update-grub].
Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'
dpkg: error processing linux-image-2.6.24-24-386 (--configure):
 subprocess post-installation script returned error exit status 2
Errors were encountered while processing:
 linux-image-2.6.24-16-xen
 linux-image-2.6.24-24-386
E: Sub-process /usr/bin/dpkg returned an error code (1)


What can I do?


Question: Travelling with electric violin under revised airport security rules
Answer: I doubt this will be an issue, but there are plenty of ways to connect your guitar to an mobile phone. I'm guessing the electric violin outputs the same signal, so it can be used in a guitar amplifier. If so, you could use one of those together with your smartphone, and some sort of sound will be produced. Or even simpler, use one of those portable practice devices, which are just a 1/4" plug and a small box you can connect headphones too.