Do
sudo apt-get install --reinstall plank=0.11.89-3 libplank1=0.11.89-3
sudo apt install --reinstall ubuntu-mate-desktop^
I get the same message. umnet dependencies and broken packages.
From what I can see - you have previously added a PPA from Martin Wimpress for our QA-team. It was not recommended for end-users.
So we need to determine a set of its packages, remove them and then install correct versions. I'll guide you in this process.
Please do the following:
sudo apt-get install aptitude
Then show the output of the below commands:
aptitude search ~o
dpkg -l | grep hirsute
$ aptitude search ~o
i flacon - Audio file splitter and converter
i A gcc-7-base - GCC, the GNU Compiler Collection (base pac
i A mac - monkey's audio lossless audio codec - bina
i teamviewer - Remote control and meeting solution.
i A ttaenc - TrueAudio (TTA) Codec - command line tool
i ubuntu-mate-colours-aqua - Aqua variant of Ubuntu MATE themes
i ubuntu-mate-colours-blue - Blue variant of Ubuntu MATE themes
i ubuntu-mate-colours-teal - Teal variant of Ubuntu MATE themes
i zoom - Zoom Cloud Meetings
$ dpkg -l | grep hirsute
ii ayatana-indicator-common 0.8.4-2ubuntu0~hirsute1.0 all libayatana-indicator shared files
ii caja 1.26.0-0ubuntu2~hirsute1.1 amd64 file manager for the MATE desktop
ii caja-common 1.26.0-0ubuntu2~hirsute1.1 all file manager for the MATE desktop (common files)
ii gir1.2-caja-2.0:amd64 1.26.0-0ubuntu2~hirsute1.1 amd64 GObject introspection data for Caja
ii gir1.2-matemenu-2.0:amd64 1.26.0-0ubuntu2~hirsute1.0 amd64 GObject introspection data for the MATE menu specification
ii libayatana-indicator3-7:amd64 0.8.4-2ubuntu0~hirsute1.0 amd64 panel indicator applet - shared library (GTK-3+ variant)
ii libayatana-indicator3-tools 0.8.4-2ubuntu0~hirsute1.0 amd64 Tools for libayatana-indicator
ii libcaja-extension1:amd64 1.26.0-0ubuntu2~hirsute1.1 amd64 libraries for Caja components
ii libmate-menu2:amd64 1.26.0-0ubuntu2~hirsute1.0 amd64 implementation of the freedesktop menu specification for MATE (library)
ii libplank-common 0.11.89-4~hirsute1.0 all Library to build an elegant, simple, clean dock (shared files)
ii libplank1:amd64 0.11.89-4~hirsute1.0 amd64 Library to build an elegant, simple, clean dock
ii mate-media 1.26.0-0ubuntu2~hirsute1.0 amd64 MATE media utilities
ii mate-media-common 1.26.0-0ubuntu2~hirsute1.0 all MATE media utilities (common files)
ii mate-menus 1.26.0-0ubuntu2~hirsute1.0 all implementation of the freedesktop menu specification for MATE
ii mate-notification-daemon 1.26.0-0ubuntu2~hirsute1.0 amd64 daemon to display passive popup notifications
ii mate-notification-daemon-common 1.26.0-0ubuntu2~hirsute1.0 all daemon to display passive popup notifications (common files)
ii python-caja-common 1.26.0-0ubuntu3~hirsute1.1 all Python binding for Caja components (common files)
ii python3-caja 1.26.0-0ubuntu3~hirsute1.1 amd64 Python3 binding for Caja components
ii ubuntu-wallpapers-hirsute 21.10.1-0ubuntu1 all Ubuntu 21.04 Wallpapers
I have just tested the following hack on my VM:
sudo apt-get install ppa-purge
sudo add-apt-repository ppa:ubuntu-mate-dev/qa-team
sudo sed -i "s/impish/hirsute/g" /etc/apt/sources.list.d/ubuntu-mate-dev-ubuntu-qa-team-impish.list
sudo ppa-purge ppa:ubuntu-mate-dev/qa-team
and then run
sudo apt install --reinstall ubuntu-mate-desktop^
Ok. Done. Do I reboot or log out and in?
I no longer get the error message in synaptic when checking PLANK for install. I have not installed, but now the error no longer appears.
To get all things to correct state the below command
sudo apt install --reinstall ubuntu-mate-desktop^
would be enough.
It's been working while now and I got a Low Disk message for root. Hope it works. Anything I can do right now to free up space. My root is 30gb.
OK - now it's finished.
Thanks so very much. You are amazing.
You are welcome. Next time, please be careful with PPA selection 
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