Since updating to gnome 3.32 on ubuntu 18.04 a few weeks ago, every time I reboot I now get a notification to update to gnome 3.34. Clicking on the link to do just this produces, after about 30 seconds of waiting, the message "Unable to update gnome application platform version 3.34". All other updates proceed without problem.
4 Answers
Type in a console/terminal:
flatpak update
helped in my case. No need to do anything guiverc suggested.
This updated the following packages:
$ flatpak update
Looking for updates…
ID Arch Branch Op Remote Download
1. [✓] org.freedesktop.Platform.Locale x86_64 18.08 u flathub 1.0 kB / 316.0 MB
3. [✓] org.freedesktop.Sdk.Locale x86_64 18.08 u flathub 1.0 kB / 319.4 MB
4. [✓] org.gnome.Platform.Locale x86_64 3.28 u flathub 1.0 kB / 188.9 MB
5. [✓] org.gnome.Platform.Locale x86_64 3.30 u flathub 1.0 kB / 320.2 MB
7. [✓] org.gnome.Platform x86_64 3.34 u flathub 1.0 kB / 318.4 MB
9. [✓] org.gnome.Sdk x86_64 3.34 u flathub 1.0 kB / 658.5 MB
10. [✓] org.gnome.Sdk.Locale x86_64 3.34 u flathub 1.0 kB / 326.3 MB
11. [✗] org.freedesktop.Platform.openh264 x86_64 19.08 i flathub 593.6 kB / 593.4 kB
Warning: org.freedesktop.Platform.openh264 not installed
Changes complete.
ID Arch Branch Remote Download
1. [✓] org.gnome.Sdk.Locale x86_64 3.32 flathub 17.4 kB / 323.2 MB
2. [✓] org.freedesktop.Platform.html5-codecs x86_64 18.08 flathub 2.9 MB / 3.3 MB
3. [✓] org.freedesktop.Platform.VAAPI.Intel x86_64 18.08 flathub 1.8 MB / 1.8 MB
Installation complete.

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Can you explain how updating flatpak solves the gnome version problem? – Organic Marble Oct 11 '19 at 12:52
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2Well, obviously some GNOME stuff is installed via flatpak, the updated packages included:
– Fini Oct 11 '19 at 15:48org.gnome.Platform 3.34 org.gnome.Sdk.Locale 3.34 org.gnome.Sdk 3.34 org.gnome.Platform.Locale 3.34 org.gnome.Platform.Locale 3.28 org.gnome.Platform.Locale 3.30 org.gnome.Platform 3.34 org.gnome.Sdk 3.34 org.gnome.Sdk.Locale 3.34 org.gnome.Sdk.Locale 3.32
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Sorry the formatting capabilities here kill me :-( Above you see what
flatpak update
updated, amoungst other packages. Anyhow, you see a lot of GNOME comes as flatpaks and needs to be updated there, as it seems. – Fini Oct 11 '19 at 15:55
I had this issue, and none of the above worked.
What seems to have worked is first I ran the command to remove unused flatpacks (seemingly mainly old ones)
flatpak uninstall --unused
As it removed unused packages, it listed them, including org.gnome.Platform
Here below I show my output:
ID Branch Op
1. [-] org.freedesktop.Platform.html5-codecs 18.08 r
2. [-] org.freedesktop.Platform 18.08 r
3. [-] org.freedesktop.Platform.Locale 18.08 r
4. [-] org.gnome.Platform 3.32 r
5. [-] org.gnome.Platform.Locale 3.32 r
6. [-] org.gnome.Platform 3.34 r
7. [-] org.gnome.Platform.Locale 3.34 r
8. [-] org.kde.Sdk 5.12 r
9. [-] org.kde.Sdk.Locale 5.12 r
10. [-] org.kde.Sdk 5.13 r
11. [-] org.kde.Sdk.Locale 5.13 r
Then I ran flatpak repair. This needs sudo
privileges.
sudo flatpak repair
It removed non-deployed packages. See output below:
Verifying flathub:runtime/org.kde.Sdk/x86_64/5.14…
Verifying deploy/runtime/org.gnome.Platform.Locale/x86_64/3.36…
Removing non-deployed ref flathub:runtime/org.freedesktop.Platform.openh264/x86_64/19.08…
Verifying flathub:runtime/org.freedesktop.Platform.openh264/x86_64/2.0…
Verifying deploy/runtime/org.freedesktop.Platform.GL.default/x86_64/19.08…
Now I'm no longer getting the message to update Gnome.
This message was sporadic - and evidently it comes from Flatpak updater.
It looks like something installed the freedom.desktopwhatever flatpak to begin with in error, and it's happening a lot, and noone is posting the correct solution, anywhere. One forum got off on a tangent about whether we are allowed to run proprietary codec freedom.desktopwhatever. If we're not, it's not our fault it's erroneously getting installed on our systems! Believe me, I never knowingly installed the Gnome desktop runtime using Flatpak, I do not think so! What a thoroughly stupid, idiotic idea.
Evidently one cannot install three of the most popular desktop environments for Ubuntu, including Gnome, without using Flatpak. What a recipe for disaster. Ubuntu needs to stop forcing people to use Flatpak. And that snapwhatever as well. It smacks of Windows 10's disasters!

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1That fixed it for me too. Basically
flatpak uninstall --unused && sudo flatpak repair
. – NiKo Dec 01 '19 at 08:29
A recipe that worked for me after a few false starts:
# flatpak update
This gave: Warning: Failed to install org.freedesktop.Platform.openh264/x86_64/19.08: Error deploying: While trying to apply extra data: runtime/org.freedesktop.Platform/x86_64/19.08 not installed
flatpak repair
flatpak install flathub org.freedesktop.Platform/x86_64/19.08
flatpak update
I believe that's done the update so clicking on the clock no longer brings up the 'update to install' notification.
If you read the error message, it will tell you that you need flatpak version 1.0.9
. You have 1.0.8
(as you are on 18.04, like me) so that's why you cannot update. But it's just a runtime for flatpak
apps, your system is actually on GNOME 3.28 (look in Settings > Details).

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ubuntu-support-status
on how many packages you have that are still supported/upgradable by the system, as moving outside of default repositories puts upgrade/patch/security on yourself. All Ubuntu-GNOME releases are now EOL; as Ubuntu switched to GNOME with 17.10 there was no reason for the Ubuntu-GNOME flavor as GNOME was the default for Ubuntu. – guiverc Oct 08 '19 at 06:02