The launcher does not open on Linux

Same issue here.

Same issue on KdeNeon with Ubuntu 24.04 base

In case MCL-24884, the workaround:

rm .minecraft/webcache2/Default/Preferences

Temporarily fix the problem, but you need to run this command every time before running minecraft-launcher

Also having this problem

MCL-24886

On windows:

C:\Users\<user>\AppData\Roaming\.minecraft

Poking through the preferences I think I found the culprit.

This chrome extension: https://chromewebstore.google.com/detail/plasma-integration/cimiefiiaegbelhefglklhhakcgmhkai

Is not working properly, removing its entry from the extensions.settings object (key is cimiefiiaegbelhefglklhhakcgmhkai) allows the launcher to load, though once the settings are back in place it will still fail next launch.

It hasn’t been updated since Sept 2024 so it is likely that a library change has impacted it.

I don't see an option to disable the extension, though I am not that familiar with embedded chrome mechanics.

the following JQ command will also do the trick for before or after launching:

jq 'del(.extensions.settings.cimiefiiaegbelhefglklhhakcgmhkai)' ~/.minecraft/webcache2/Default/Preference
s > ~/.minecraft/webcache2/Default/Preferences.tmp && mv ~/.minecraft/webcache2/Default/Preferences.tmp ~/.min
ecraft/webcache2/Default/Preferences

Hopefully this will help speed the correction of this issue along.

I reccommend switching to a third party launcher like Prism. Prism let’s me push the game over to my dGPU with a single checkbox. The stock launcher does not and I do not care to figure out how to add the jre to the Prime list or whatever. Also, you can extremely easily set up modded instances. And doesn’t crash every second and further time you launch it.

I did this:

sudo pacman -R plasma-integration plasma-workspace kdeplasma-addons plasma-browser-integration plasma-desktop plasma-nm plasma-pa plasma-vault powerdevil xdg-desktop-portal-kde plasma-welcome

and it worked again. I would suggest switching to Cinnamon, Xfce4, or MATE and just using the kde-apps separate from the DE.

Same issue here. Error logs match what has been supplied. This worked for me a week or two ago, and then it broke, not sure why. Fix that @Jared gives works: remove preferences file and it opens, but that’s a drag. Running Garuda (Arch) on an Intel 6600 with an nVidia 3060 ti gpu, proprietary drivers.

Same issue but here is the output log for mine

Created browser window for reuse: 0x1000004
[21198:21198:0316/203202.951812:ERROR:browser_main_loop.cc(280)] Gdk: _gdk_frame_clock_freeze: assertion 'GDK_IS_FRAME_CLOCK (clock)' failed
[21245:21245:0316/203205.193663:ERROR:gl_surface_presentation_helper.cc(260)] GetVSyncParametersIfAvailable() failed for 1 times!
[21245:21245:0316/203205.202153:ERROR:gl_surface_presentation_helper.cc(260)] GetVSyncParametersIfAvailable() failed for 2 times!
[21245:21245:0316/203207.083618:ERROR:gl_surface_presentation_helper.cc(260)] GetVSyncParametersIfAvailable() failed for 3 times!
terminate called after throwing an instance of 'std::bad_function_call'
what(): bad_function_call
[21198:21231:0316/203209.191852:ERROR:cast_crl.cc(443)] CRL - Verification failed.

I tried the “rm .minecraft/webcache2/Default/Preferences“ and it seems to work but has to be done every time before a minecraft launcher launch.

Seems like something is failing while fetching entitlements, from ~/.minecraft/launcher_log.txt:

[Info: 2025-03-27 03:22:41.021477668: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(589)] Broadcasting change due to setting [forced:1] Entitlements to cached state for <ACCOUNT ID>
[Warning: 2025-03-27 03:22:41.021513872: c/ztmruzt+Y=: UnifiedAccounts.cpp(195)] Lost entitlements updated callback context
[Info: 2025-03-27 03:22:41.021718330: kBXJFOzIMjI=: NetQueue.cpp(208)] NetQueue: Starting net action https://api.minecraftservices.com/entitlements/license?requestId=<REQUEST ID>
[Info: 2025-03-27 03:22:41.021760066: kBXJFOzIMjI=: NetQueue.cpp(211)] NetQueue: Action debug details (https://api.minecraftservices.com/entitlements/license?requestId=<REQUEST ID>):
	Method: GET
	Headers: 
		Authorization:Bearer <TOKEN>
		Content-Type:application/json
	Body: 
[Info: 2025-03-27 03:22:41.026811294: 865QN+YQkGw=: NetQueue.cpp(57)] NetQueue: Initiating shutdown.
[Info: 2025-03-27 03:22:41.026846994: 865QN+YQkGw=: NetQueue.cpp(71)] NetQueue: Waiting for worker thread to finish...
[Info: 2025-03-27 03:22:41.403811836: kBXJFOzIMjI=: NetQueue.cpp(414)] NetQueue: Worker thread shutting down.
[Info: 2025-03-27 03:22:41.403920407: kBXJFOzIMjI=: NetQueue.cpp(381)] NetQueue: Aborting (1) in progress requests
[Error: 2025-03-27 03:22:41.404202689: kBXJFOzIMjI=: Common_p.h(202)] Error while sending request to https://api.minecraftservices.com/entitlements/license?requestId=<REQUEST ID>
[Error: 2025-03-27 03:22:41.404358613: c/ztmruzt+Y=: EntitlementsManager.cpp(219)] Failed to get entitlements from the services API... Error: 9
[Info: 2025-03-27 03:22:41.407046487: c/ztmruzt+Y=: EntitlementsManager.cpp(712)] Entitlement Health - [okay], [okay], [okay], [okay], [okay], [okay], GREEN, 385
[Info: 2025-03-27 03:22:41.407145270: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(626)] Have valid access token, fetching profile
[Error: 2025-03-27 03:22:41.407396990: c/ztmruzt+Y=: MinecraftServicesApi.cpp(930)] Unable to access MinecraftServices, no available Netqueue
[Error: 2025-03-27 03:22:41.407464562: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1445)] Failed to fetch Minecraft profile. Service error: 7
[Error: 2025-03-27 03:22:41.407492682: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(654)] Failed to get profile for MSA account <ACCOUNT NUMBER>. Error: Profile fetch failed
[Info: 2025-03-27 03:22:41.407511488: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1660)] Fetching Realms subscription data for account <ACCOUNT ID>
[Info: 2025-03-27 03:22:41.407554981: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1796)] Fetching Marketplace subscription data for account <ACCOUNT ID>
[Info: 2025-03-27 03:22:41.407577125: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(667)] Broadcasting change due to new [forced:1] Entitlements for <ACCOUNT ID>
[Warning: 2025-03-27 03:22:41.407595558: c/ztmruzt+Y=: UnifiedAccounts.cpp(195)] Lost entitlements updated callback context
[Info: 2025-03-27 03:22:41.407881623: 865QN+YQkGw=: NetQueue.cpp(74)] NetQueue: Done.
[Warning: 2025-03-27 03:22:41.409194787: 865QN+YQkGw=: CefUI.cpp(29)] X error received: type 0, serial 283, error_code 3, request_code 10, minor_code 0
[Info: 2025-03-27 03:22:41.409417337: c/ztmruzt+Y=: NetQueue.cpp(57)] NetQueue: Initiating shutdown.
[Info: 2025-03-27 03:22:41.409481082: c/ztmruzt+Y=: NetQueue.cpp(71)] NetQueue: Waiting for worker thread to finish...
[Info: 2025-03-27 03:22:41.409580978: /H7BwbKbafo=: NetQueue.cpp(414)] NetQueue: Worker thread shutting down.
[Info: 2025-03-27 03:22:41.412469288: c/ztmruzt+Y=: NetQueue.cpp(74)] NetQueue: Done.
[Warning: 2025-03-27 03:22:41.412569093: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(837)] Missing context while retrieving Realms subscription state for <ACCOUNT ID>
[Warning: 2025-03-27 03:22:41.412599313: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1006)] Missing context while performing Realms unassociated subscription check for <ACCOUNT ID>
[Warning: 2025-03-27 03:22:41.412623954: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1100)] Missing context while performing Realms next available subscription check for <ACCOUNT ID>
[Info: 2025-03-27 03:22:41.412646021: c/ztmruzt+Y=: UnifiedMSAAccounts.cpp(1674)] Missing context while retrieving Marketplace subscriptions for <ACCOUNT ID>
[Info: 2025-03-27 03:22:41.451719819: 865QN+YQkGw=: StartLibrary.cpp(123)] Launcher ended with 0

Same issue, I’m currently using Bazzite, it seems to have a slight delay when closing the error page, starting with a black page and then freezing before closing. I fixed the problem by just erasing the whole webcache2 folder before. Same with just erasing the Preferences folder, it doesn’t fix now.

(Hopefully) working solution:

I wrote a following bash script:

#!/bin/bash
rm ~/.minecraft/webcache2/Default/Preferences
minecraft-launcher &

And replaced minecraft-launcher with the script location in the .desktop file (alternatively you can just run the script directly). The script must have an “executable” attribute set. This can be done either by right-clicking on the file, going to preferences, permissions and checking the “executable” checkbox, or running a command chmod +x <script-filename>.

Explanation:
The launcher seems to clash with plasma-integration extension, and the simplest way to fix it is removing the browser’s preferences file (located by default in ~/.minecraft/webcache2/Default/Preferences).

First line of the script says its a bash script (should be executed by /bin/bash).
The second line removes the file ~/.minecraft/webcache2/Default/Preferences
The third line launches the minecraft-launcher and closes the script without waiting (the & character in the end) so it doesn’t stay open the whole time you play.

Hope this helps, it worked for me.

Discussion on AUR points to a bug with kde-browser-installation. Others have reported that uninstalling that package fixes the problem. It places the extension /usr/share/chromium/extensions/cimiefiiaegbelhefglklhhakcgmhkai.json I can confirm that removing this file allows Minecraft launcher to boot normally on repeated attempts.

The file apparently allows chromium-based browsers to automatically install the extension. I cannot confirm how removing the file affects kde-browser-integration with other chromium browsers (I am using Firefox), but it evidently doesn’t play well with ML’s built-in browser.

The bug has been reported to KDE (https://bugs.kde.org/show_bug.cgi?id=501866 ) and on this forum at MCL-25003. If you want to check out the AUR discussion: https://aur.archlinux.org/packages/minecraft-launcher

The startup hack removes the window size preference… many other options persist.

My 2 cents: I don’t think it’s KDE’s prerogative to remove the automatic extension installation. The Minecraft Launcher is not designed to function as a web browser and thus should not be inheriting anything from OS browser defaults.