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 It appears the installed Ungoogled-chromium flatpak package was marked as end-of-life and has been replaced by something at a new GitHub path.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