Yesterday I lauched the upgrade process with "Software & Updates" Setting in System Settings.

During the process i was surfing the web, suddenly the scrren goes black and my laptop start to reboot, i got the rotating logo at startup then when the login screen should appear i got a blinking screen for like 3-5sec then i m auto redirected to tty1

Looking to log show that gnome crash with error 127 du to not found shared library, i try to reinstall gnome from tty2 then it show a list of unmeet dependancy, look like all my ppa got remplaced to 18.04 and i got error when try to apt get install like "depend package-name but ubuntu 16.04 is installed"

Im a newbi in linux world even if i master command line :D Hope you can help

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