Yesterday, I updated my minecraft launcher on my Linux - Manjaro (Arch-based Linux distro) and then it just stopped working.
It crashes always, when I want to start it.
I put here thebootstrap_log.txt, it's the only file that got rewritten.
PS: Sorry for my bad english.
And the version, that shows to me is actually: minecraft-launcher 915-1
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Ok, so I created a backup of my .minecraft folder and started the launcher.
First, I got the error, as you wrote, but with the second attempt it reinstalled itself.
And then, I just uploaded back my versions, and configs etc.
So it worked! Thanks a lot!
I also have this issue on Ubuntu 18.04, updated the launcher and now it won't start from either the command line or clicking the icon. Removed the .minecraft folder, now there is nothing there but an empty .launcher folder. Launcher is still not launching. I also tried downloading the alternative .deb from https://www.minecraft.net/en-us/download/alternative but that didn't change anything.
I had the same error on Ubuntu 20.04 with an existing `.minecraft` directory. When I remove the directory and try again, I run into the `is not a valid directory` issue:
merlijn@howard:~/Downloads/Minecraft(1)/minecraft-launcher$ ./minecraft-launcher
[Info: 2021-03-11 16:51:02.309006261: NetQueue.cpp(157)] NetQueue: Setting up.
[Info: 2021-03-11 16:51:02.309302930: mainLinux.cpp(250)] Running launcher bootstrap (version 915)
[Info: 2021-03-11 16:51:02.309183842: NetQueue.cpp(575)] NetQueue: worker thread started.
[Debug: 2021-03-11 16:51:02.309589445: PlatformLinux.cpp(44)] HOME dir (getpwuid): /home/merlijn
[Debug: 2021-03-11 16:51:02.309601690: PlatformLinux.cpp(49)] HOME dir (env): /home/merlijn
[Error: 2021-03-11 16:51:02.310450485: Settings.cpp(40)] Failed to determine configuration file size: No such file or directory
[Info: 2021-03-11 16:51:02.310962141: Common.cpp(32)] Native Launcher Version: 915
[Info: 2021-03-11 16:51:02.310981386: Common.cpp(33)] Operating System: Linux
[Info: 2021-03-11 16:51:02.310994280: Common.cpp(34)] Application Data directory: //.../.minecraft
[Info: 2021-03-11 16:51:02.311009290: Common.cpp(35)] Executable Path: /.../minecraft-launcher
[Info: 2021-03-11 16:51:02.311020203: Common.cpp(36)] App Directory dir: //.../minecraft-launcher
[Info: 2021-03-11 16:51:02.311030579: Common.cpp(37)] Game data directory: //.../.minecraft
[Info: 2021-03-11 16:51:02.311040630: Common.cpp(38)] Launcher dir: //.../launcher
[Info: 2021-03-11 16:51:02.311053767: Common.cpp(39)] Java dir: //.../jre-x64
[Info: 2021-03-11 16:51:02.311064226: Common.cpp(40)] TmpDir dir: //.../MinecraftLauncher.1000
[Info: 2021-03-11 16:51:02.311074251: Common.cpp(41)] x64: true
[Info: 2021-03-11 16:51:02.311549053: mainLinux.cpp(308)] relaunchedExe: /home/merlijn/.minecraft/launcher/minecraft-launcher selfExe: /home/merlijn/Downloads/Minecraft(1)/minecraft-launcher/minecraft-launcher
[Info: 2021-03-11 16:51:02.311606914: mainLinux.cpp(312)] Top level executable, forwarding signals.
[Error: 2021-03-11 16:51:02.311648880: mainLinux.cpp(330)] Invalid start directory!
MessageBox(Minecraft Launcher): Cannot start Minecraft in "/home/merlijn/.minecraft": the specified path is not a valid directory.
[Info: 2021-03-11 16:51:02.312662503: NetQueue.cpp(585)] NetQueue: Starting net action [https://sentry.io/api/5254002/store/]
More info: MCL-17155