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I have been using Linux Mint (Cinnamon) for at least a year. Started with 18.1 and once 18.2 was available I did the upgrade to it. Everything has been working perfectly. Yesterday, when I turned on my computer it won't boot. I can see the grub2 menu, the Linux Mint logo being displayed and then I get a white cursor at the top left corner. Nothing else. I tried editing the grub2 load adding the "nomodeset grub_gfxmode=1280x1024x24" but still having the same issue. I was able to get to a command line by doing Ctrl+Alt+F1, able to log in, I ran sudo apt purge "nvidia-*" and then doing startx starts the GUI. But for some reason I have now to do this every time I boot the computer (without the sudo apt purge "nvidia-*").

More information that may help find the root cause and how to fix it:

/etc/X11/default-display-manager says "/usr/sbin/lightdm"

I tried running sudo systemctl start mdm but got error "Failed to start mdm.service: Unit mdm service not found".

Update manager says there is no updates.

Running kernel 4.10.0-35.

Dual booting with Windows 7

I need your help to see what is going on and what made it fail, and hopefully be able to restore it (I have several files/configurations that need to preserve).

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Ok, I did: sudo dpkg-reconfigure lightdm and that worked! Don't know what this does, but it fixed my problem. Thanks

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