After installing successfully Ubuntu-Mate 16.04 today and having run it for hours I asked for a system update using Synaptic.
Update was successful. BUT when I tried to install a new soft I could not.
Synaptic is requesting a password, which is the same as usual, but denied to let me access.
The amazing part is that rebooting the system I was able to access without trouble using my password (the one which was defined during the installation process) but the same password is not recognized when trying to use Synaptic or the terminal MATE.
When the PC switched to standby mode the password does not work. BUT if I ask for “change user” I come back to the login window and the password is functional.
I have never had such behaviour. Does anyone have an idea to solve this issue ?
Thank you for helping