How to get a larger root partition on Touch

This solution worked for me:

https://github.com/plasma-mobile/plasma-phone-dev-setup/blob/master/usr/bin/resize-root-partition

Basically, it's KDE Plasma Mobile's super-simple install script. Just run it, take a nap, and you should have a 6 GB root partition.

Here's the quickest way I've figured out to do it.

Warning: This may break your phone if typed incorrectly. Ensure you have full backups before beginning and are willing to make mistakes in case you lose all data on your phone. This example command resizes the root filesystem to 6GB, so if it's already bigger than that it will be truncated and your phone likely will become unbootable (until re-imaged). Only use this command if your root filesystem image is less than 6GB (the Ubuntu Touch default is 2GB).

$ sudo -s
# dd if=/dev/null of=/userdata/ubuntu.img bs=1M seek=6000 count=0
# resize2fs -f /userdata/ubuntu.img
# reboot