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I use Lyx in Xubuntu 18.04. Yesterday I installed a system update via the "software update" application, and now I cannot write x² in math mode because when I hit the key '^' instead of introduce the '^' symbol it seems to be introducing '\^'. I mean, this is what I get in Lyx:

enter image description here

and there is no way to introduce this:

enter image description here

using only the keyboard.


I have recorded a screencast showing the screen refresh problem in this link.

  • Very strange. I don't think I've heard of this problem before. I use LyX daily on Ubuntu and have not seen this. What does apt-cache policy lyx show for you? – scottkosty Oct 3 '18 at 14:37
  • I shows me this. – user171780 Oct 3 '18 at 14:47
  • I'm not sure what went wrong. I'm using 2.3.1 (but not from the PPA, I self-compiled). On Mint, we have heard of some weird issues with fonts, but I don't remember the symptoms being like what you described. It seems more like the keymaps got confused somewhere. You could try 1. exiting LyX; 2. moving your LyX user directory to somewhere else; 3. restarting LyX. If this does fix the problem, please do not remove your old user directory. We should figure out what the root problem was. – scottkosty Oct 3 '18 at 15:01
  • When you say "LyX user directory" do you mean the ".lyx" directory located in home? If yes, then I did that and the problem was not fixed. Also, what about the screen refresh problem? As far as I have read the update included changes in the way the screen is refreshed. Maybe it is a bug? – user171780 Oct 3 '18 at 15:13
  • Yes that is what I meant (it is the directory listed in Help > About). Yes, it could be that an update caused the bug, but it is strange that I do not see it on my system. I'm not sure what to suggest further. – scottkosty Oct 3 '18 at 15:52
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The problem is due to a LyX bug that was introduced in version 2.3.1, and should be fixed with LyX version 2.3.2. The bug report and relevant discussion can be found here.

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