I have installed two different users on Mint Julia, one as "administrator" and one as desktop "user" with restricted rights (like on former Windows XP). Normally I work with my "user" account - using the "administrator" only for updates.
Currently I cannot login as standard user. After submitting the password the screen gets dark for a few seconds and then the login screen reappears again. But I can still login as administrator.
What had happened?
* I accidentally erased all data in folder /home
* I restored the data from a backup  i.e. I saved back the /home folder to the original partition
* there are two folders now in /home, "administrator" and "user" (as it used to be before I deleted everything)
[Edit] I can login as "administrator" and access the /home folder of "user", but I cannot use the data easily because of user rights and permissions
I cannot even copy files in the "user" home folder without doing a terminal with sudo which is quite awkward [/edit]
Therefore I would need help in 1) either repairing the password login for "user"
or 2) in migrating all my "user" data and settings to a new account so that I can have full access to my Thunderbird, Firefox etc. and different programm settings.