Root partition too small

[AlainKnaff]

At 2 Gigabytes the root partition is far too small, making upgrades unnecessary painful (as the root partition needs to hold all of:
1. old system (which won't be freed up completely, because active apps still hold references to the old libraries and executables)
2. newly downloaded .deb files in /var/cache/apt/archives/
3. upgraded system

For this the 200M free space is not sufficient, and the upgrade needs constant babysitting (removing the .deb files from /var/cache/apt/archives/ as soon as they've been unpacked)

A root partition of 3G would give more breathing room.

Is there an easy way to grow it?

Some online resources, such as http://askubuntu.com/questions/514913/how-to-get-a-larger-root-partition-on-touch no longer work, as the root image is no longer being kept in /userdata

[AlainKnaff (kubuntu-misc)]

Similarly, the script at the address no longer works, due to /userdata no longer containing a system.img with the whole root partition. The only system.img there is is /var/lib/lxc/android/system.img but that only contains the device-dependant Android files, rather than whole root fs.

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