I went back to Android because of this, so i can't check it again, and i don't want to write eMMc until i'm sure everything will work.
When i tried to connect as root in terminal, i would get error about incorrect password, this was unix password that i have chosen.
When i pressed ctrl+alt+f2 to go to login screen, and immediately logging in as root user, password was accepted, everything was ok, but when i return to terminal, password was not correct.
I tried to change unix password, for myname@khadas and root@khadas, everything would be saved, but in terminal still nothing.
I am not a Linux expert, so sorry if this isn't very understandable, i did explain to you the best i could.
I did try many passwords, default, nothing worked.
The only thing i managed to install pressing ctrl+alt+f2, logging as root, was Ubuntu software center.