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If I press Alt-^ Ubuntu 18.04 (Gnome) freezes.

I can still move the mouse and I can shutdown the PC.

But keyboard input is frozen.

I press this combination sometimes accidentally when I want to press Alt-Esc.

What am I doing wrong?

Is there something I can do to prevent Ubuntu from freezing?

I have german keyboard layout with dead-keys.

guettli
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    Just to be clear, this is 6 ? And , C , and repeating 6 have no effect? Does this happen regardless of the front application in use? – Carl Witthoft Mar 04 '19 at 13:29
  • @CarlWitthoft what does " 6 ? And , C , and repeating 6" do? – guettli Mar 04 '19 at 13:42
  • You have things freezing here as well: https://askubuntu.com/questions/1116659/alt-esc-to-switch-between-windows-window-manager-is-hanging – DK Bose Mar 04 '19 at 14:15
  • And Alt ^ is pretty far away (on the keyboard) from Alt+Esc at least on an standard En-US keyboard. Are they close together on your keyboard? – DK Bose Mar 04 '19 at 14:18
  • @DKBose "^" is directly below ESC on my lenovo keyboard (german layout). I guess the freezing on ALT-ESC comes from accidentally touching ^ instead of ESC. – guettli Mar 04 '19 at 14:44
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    On an English keyboard, Alt ^ requires pressing three keys together: Alt+Shift+6. – DK Bose Mar 04 '19 at 14:54
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    @guettli I'm using standard (English) nomenclature for "hold down the "ALT" and "SHIFT" and "6" key simultaneously. – Carl Witthoft Mar 04 '19 at 15:00
  • I've asked you before and I'll again: does the same problem occur on other machines? – DK Bose Mar 05 '19 at 02:03
  • @DKBose I tried it on a different hardware with same setup (Ubuntu 18.04, Gnome, German keyboard). Unfortunately it is working. It was not reproducible on different hardware. On my hardware it is reproducible. – guettli Mar 05 '19 at 17:10
  • So could this then be a hardware issue on this particular machine? – DK Bose Mar 05 '19 at 17:14
  • @DKBose my keyboard is connected via usb. I think the keyboard should be allowed to send broken data is much as it wants to. To desktop must not freeze. The keyboard works for me very nice. – guettli Mar 05 '19 at 17:16
  • @DKBose keyboard freeze after alt-^ happens on the internal keyboard and on the sub keyboard. I don't think it is an hardware issue. – guettli Mar 06 '19 at 09:46
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    In that case, can you try with a new user on the problematic machine? It could be that some tweak you've made to the current user is causing the issue. – DK Bose Mar 06 '19 at 10:32
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    @DKBose I created a new user on the problematic machine. There it does not freeze. Very strange. I have no unusual config – guettli Mar 06 '19 at 11:24
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    Well, as you've seen, there is a difference in behavior. So there must be something going on! I hope you figure out what that is: conflicting keyboard shortcuts, reassigned keys, etc. All the best! – DK Bose Mar 06 '19 at 11:42
  • Yep, if a different account works, then there is a corrupted config somewhere, or possibly a strange config that was unintentionally modified. Fastest and simplest thing to do is back up your "regular" files , copy to a brand new account, and kill the offending account. – Carl Witthoft Mar 06 '19 at 13:57

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