Linux Mint Update Manager will not install flatpak package ungoogled-chromium

The Problem:

I have an update that Update Manager just will not install Ungoogled-chromium version 29c28588b7 . I can click refresh and install updates. However, Nothing happens on trying to install just the package Ungoogled-chromium e.g. no prompt for password no indication of any kind of problem. A handful of other updates I was able to install this morning normally, but this one just will not install. Was running Linux Mint 21.3 Cinnamon (6.0.4) and 5.15.0-105-generic on x86_64 system.

The Cause

The installed Ungoogled-chromium version 29c28588b7 has been marked as end-of-life in Flatpak, and Software Manager is giving no indication of what going wrong besides the update not installing.

The fix:

1. Recognize from the window that this stuck package is a Flatpak package, hint it’s the Type column and the cube icon.
2. open the Terminal program.
3. Run flatpak update as can be viewed in the output below. It appears the installed Ungoogled-chromium flatpak package was marked as end-of-life and has been replaced by something at a new GitHub path.

Here is a brief summary of the changes that occurred: com.github.Eloston.UngoogledChromium (old) vs io.github.ungoogled_software.ungoogled_chromium (new)

   daniel@Lili-Linux:~$ flatpak update
   Looking for updates…
   Info: (pinned) org.freedesktop.Platform.VAAPI.Intel//21.08 is end-of-life, with reason:
   org.freedesktop.Platform 21.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
   Info: (pinned) org.freedesktop.Platform.GL.default//21.08 is end-of-life, with reason:
   org.freedesktop.Platform 21.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
   Info: com.github.Eloston.UngoogledChromium.Locale//stable is end-of-life, in favor of runtime/io.github.ungoogled_software.ungoogled_chromium.Locale/x86_64/stable
   Replace it with runtime/io.github.ungoogled_software.ungoogled_chromium.Locale/x86_64/stable? [Y/n]: Y
   Info: com.github.Eloston.UngoogledChromium.Codecs//stable is end-of-life, in favor of runtime/io.github.ungoogled_software.ungoogled_chromium.Codecs/x86_64/stable
   Replace it with runtime/io.github.ungoogled_software.ungoogled_chromium.Codecs/x86_64/stable? [Y/n]: Y
   Info: com.github.Eloston.UngoogledChromium//stable is end-of-life, in favor of app/io.github.ungoogled_software.ungoogled_chromium/x86_64/stable
   Replace it with app/io.github.ungoogled_software.ungoogled_chromium/x86_64/stable? [Y/n]: Y

   io.github.ungoogled_software.ungoogled_chromium permissions:
   ipc              network          cups               pcsc
   pulseaudio       wayland          x11                devices
   file access [1]  dbus access [2]  bus ownership [3]  system dbus access [4]

   [1] /run/.heim_org.h5l.kcm-socket, home
   [2] com.canonical.AppMenu.Registrar, org.freedesktop.FileManager1,
   org.freedesktop.Notifications, org.freedesktop.ScreenSaver,
   org.freedesktop.secrets, org.gnome.SessionManager, org.kde.kwalletd5,
   org.kde.kwalletd6
       ID                                                                       Branch              Op              Remote              Download
      1. [-] com.github.Eloston.UngoogledChromium                                stable              r
      2. [-] com.github.Eloston.UngoogledChromium.Codecs                         stable              r
      3. [-] com.github.Eloston.UngoogledChromium.Locale                         stable              r
      4. [✓] io.github.ungoogled_software.ungoogled_chromium.Codecs              stable              i               flathub             992.5 kB / 991.6 kB
      5. [✓] io.github.ungoogled_software.ungoogled_chromium.Locale              stable              i               flathub             184.5 kB / 184.7 kB
      6. [✓] io.github.ungoogled_software.ungoogled_chromium                     stable              i               flathub             147.6 MB / 153.1 MB

   Changes complete.