I just managed to install lollipop thanks to the advice of kyrylo who sent me on a tutorial very well explained: https://forum.xda-developers.com/nexus-4/general/how-to-how-to-flash-factory-image-t2010312
Merci à tous !

ok my nexus 4 hangs on the google logo ... when I turn it off it turns on by itself and remains blocked. the story gets complicated, I imagine it is by making mistakes that we learn
I do not know what to do...

i have lollipop and nitrogen

I tried to install several roms on my nexus 4 (kitkat, lollipop, nitrogen) with TWRP but it does not work, during the installation on the nexus it is written:
"disassembly failed '/ system' (invalid argument)"
then a little further:
"the updater process has ended with ERROR: 7 Error installing zip file"
Do you have an idea ?
Have a good day !

Thank you for your answers so fast, I will try to put Android back because I like to tinker and like that I will do it.
I'll keep you posted, thank you!

Hello everybody,
After a lot of research, I did not manage to find if we could switch from ubports to android because I want to resell a nexus 4 and a nexus 5 which are under ubports.
I do not know if it is possible and how to do it.
I specify that I am a novice ...
Regards,

Sylvain