I added a reply about this problem under another topic called "No Desktop." I was thinking my problem was similar but then I realized that that topic was labeled "Solved" so people may not bother to look at it. Here is what I said:
I also have gone through the upgrade process and am having a desktop issue. When booting I get a completely garbled screen with lots of randomly colored blocks. When it gets to the place where I would normally login, I do so in the blind. Everything seems to be going normally but the screen is still all messed up. When it finally finishes booting, I can hit the power button and it starts doing a shutdown, then after a little time it reverts to the normal screen for the user login. At that point, I login and everything comes up fine and it is all running and looks fine. Very strange. Just for the heck of it I tried the sudo apt-get install plasma-desktop command and it reported I had the latest version.
I also have gone through the upgrade process and am having a desktop issue. When booting I get a completely garbled screen with lots of randomly colored blocks. When it gets to the place where I would normally login, I do so in the blind. Everything seems to be going normally but the screen is still all messed up. When it finally finishes booting, I can hit the power button and it starts doing a shutdown, then after a little time it reverts to the normal screen for the user login. At that point, I login and everything comes up fine and it is all running and looks fine. Very strange. Just for the heck of it I tried the sudo apt-get install plasma-desktop command and it reported I had the latest version.
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