I upgraded from 18.04 to 18.10 using the standard procedure, and now alt+tab for switching between applications doesn't work anymore.
Any idea on how I could fix this?
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I encountered a similar issue after upgrade to 18.10 and upgraded the "AlternateTab" Gnome extension, as well
Afterwards, I encountered an issue where a red "Error" box appeared next to the extension and it still was not working post upgrade
To resolve, I had to restart my machine