Hello everyone!
I wanted to tell you, if you are interested, that I have created a special program to resize the partition of your ubuntu phone from 2 giga to about 6G! For now it is only available for linux x64 but I will soon compile the program for the other operating systems as well. Warning! This is the first version of the program and there may be bugs. If you are not sure look at the second link, where there is a bash script to do it!
Program with gui:
https://github.com/micky-it/UT-repartitioning-tool-GUI
Bash script:
https://github.com/micky-it/UT-repartitioning-script
Sorry for my bad English!
Please read the readme carefully before using the program!