User-agent:
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6
as you ask me I explain here before on Xda. On some old device we didn't
have enougth space on /data to install ubuntu chroot, like gh1234
explain to me.
So I've modded one of the "preinstalled-touch-armhf.zip" to install
"ubuntu-rootfs.tar.gz" from /sdcard instead of inside the zip file.