When I turned on my machine today my Ubuntu 17.10 first off refused to log me in, returning to the log in prompt after, correct, entry of my password. I rebooted and now it gets stuck part way, the screen is black but very briefly flashes some white text repeatedly, which I am unable to read. There was an update last night, I am wondering if that broke something.
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Ah - autoupdate? Can you run through the procedures of https://askubuntu.com/questions/162075/my-computer-boots-to-a-black-screen-what-options-do-i-have-to-fix-it – Charles Green Jan 10 '18 at 17:00
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Ok, some playing around after reading the stuff Charles pointed to and I went into the advanced menu and found 4 versions of the linux kernel listed 4.13.0-16 4.13.0-19 4.13.0-21 4.13.0-25
Using the latest 4.13.0-25 the system boots fine. I checked my GRUB configuration and the default "Ubuntu 17.10" option still pointed to "-19"! So there have been two updates and GRUB hasn't been updated for either. Anyway, this has fixed my problem now, thanks Charles for pointing me in the right direction.
I do wonder if this is a general problem, or if it is related to my use of "Grub Customizer". Either way it might help someone else who is stuck.

Chris
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This looks like some additional information based on comments. Please edit your question and add this information in the question. Have you tried
sudo update grub
? – user68186 Jan 10 '18 at 17:16 -