Okay, i was able to bypass this problem:
- try to change something that needs verification from root --> enter root/sudo password
- change name again --> works
so the problem is, that users-admin starts without permissions to change the name and ignores all input
Okay, i was able to bypass this problem:
- try to change something that needs verification from root
--> enter root/sudo password
- change name again
--> works
so the problem is, that users-admin starts without permissions to change the name and ignores all input