I tried Ubuntu touch using ubports installation program on my nexus 5. That was interesting but I need to reinstall Android, which I did. But apparently I have two partitions on my phone because I have less than half of the memory I'm supposed to have on the freshly new Android install (12.5Go).
Can someone know, how to format the partitions and merger them into one? I have no problem to install Android, I just want to recover the full memory capacity (32Go). I want to completely remove Ubuntu touch from this phone.
I'm using adb on Ubuntu 18.04.
[I'm talking about mobile phones not computers: I know how to format a hard drive on Ubuntu-desktop.]