[WLUG] screen rotated

[Dayringer, Charles]

I have installed ubuntu 18.04, it was working fine for a day, but now 
when I start up, I log in ok, it appears normal for about a minute, then 
rotates 90 degrees left, making it nearly impossible to use.
What happened?
HP pavilion laptop - I've been running various distros fine on this 
machine for a couple of years, I don't know how to get it to stay 
horizontal. What can I do?
-cd
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