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I installed MATE desktop on a vanilla Ubuntu 18.04 installation that had been upgraded from 16.04, using apt install ubuntu-mate-core ubuntu-mate-desktop (as per the instructions on wiki.mate-desktop.org/download#ubuntu), because the Mutiny panel layout provides my favorite user experience on a Linux desktop (along with the sadly defunct Unity).

I can apply the Mutiny layout using MATE Tweak, but after a reboot the icons on the top panel appear duplicated, as per the screenshot below:

ubuntu mate mutiny layout bug

Additionally, when I press the Super (Windows) key and the HUD is displayed, it doesn't disappear after I click an icon nor if I press the key again, it just stays like this:

enter image description here

Additionally, if I use a keyboart shortcut - for example, I use Ctrl+R to open a terminal and Super+E for file explorer - the corresponding app is launched twice.

This also happens if I reset the panel layout (e.g. by switching to something like Netbook and then back to Mutiny) and then logout and login.

EDIT 1:

I removed MATE Desktop using sudo apt remove --purge --autoremove ubuntu-mate-* mate-*, rebooted, then apt update and sudo apt-get install ubuntu-mate-desktop^, to reinstall as per @N0rbert's suggestion in the comments. However, after rebooting the desktop still has duplicated items (screenshot below). If I use Mate Tweak to change the layout to Mutiny, it displays fine, but after logging out and back in the panel icons are duplicated again.

enter image description here

EDIT 2

I executed dconf reset -f /org/mate/ as suggested, then used MATE Tweak to set the layout to Mutiny, and everything looked fine until I logout/login or reboot, after which the panel icons are duplicated, as shown below:

enter image description here

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  • Please use task installation with sudo apt-get install ubuntu-mate-desktop^. It is correct way of Ubuntu MATE installation. If problem persists, then ping me back. – N0rbert Jul 23 '19 at 20:33
  • Thanks @N0rbert , I edited my question following your comment, the top panel still displays duplicate items. – jmng Jul 23 '19 at 21:57
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    I'm sorry, I can't reproduce this behaviour. And do not have ideas why it happens. I see your question on Ubuntu MATE Community, I hope you'll solution there :) – N0rbert Jul 24 '19 at 15:02
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    @N0rbert , I appreciate the huge effort you put into this issue, but this is my main work laptop so I need to go with a safer but still good option: the Netbook layout with some minor tweaks :) When 20.04.1 is out I'll do a clean install of Ubuntu MATE :) – jmng Jul 25 '19 at 18:25
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I'll suggest to reset all MATE settings. It is safe as you have freshly installed it.
The command to reset MATE settings is the following:

dconf reset -f /org/mate/

and then set Mutiny layout from MATE Tweak (mate-tweak) again.

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  • Thanks, I edited my answer after doing that, the icons are still duplicated after logout/login or reboot. – jmng Jul 24 '19 at 13:49

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