I can't log in Ubuntu 14.04 LTS after I accepted the usual Software Updater updates this morning, including codec updates and the latest Thunderbird release. Now when I enter my usual login and password, the system seems to load the desktop as usual but then gets stuck indefinitely.
Only the guest login will allow me to see a plain desktop with no privileges.
I tried to apply the Ctrl+Alt+F1/Ctrl+Alt+F7 or the
XAuthority manips found in similar threads, but here again I can't sudo anything without prior typing my admin User login & password. From there on I only get an obvious error message: invalid User/Login.
How come such a simple update suddenly change/overwrite your regular user account password, I already lost half-a-day of work because of this.
Please advise on how I can get my user account logging in normally just as this very morning before I downloaded these updates.
Thanks for your support & sound answers.