Syncthing doesn't open on Linux

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1

My native language isn’t English, so i’ll try my best

I have Linux Mint 22.1 Cinnamon. I recently installed Syncthing, and it worked perfectly, but after a couple hours I tried opening it using the terminal, as usual, and I tried the command syncthing to open it but i received the next message:

[start] 2025/07/28 19:11:06 INFO: syncthing v2.0.0-rc.23 "Hafnium Hornet" (go1.24.4 linux-amd64) debian@github.syncthing.net 2025-07-06 18:56:56 UTC [noupgrade, noupgrade]
[start] 2025/07/28 19:11:06 WARNING: Failed to acquire lock: is another Syncthing instance already running?
[monitor] 2025/07/28 19:11:06 INFO: Syncthing exited: exit status 1
[start] 2025/07/28 19:11:07 INFO: syncthing v2.0.0-rc.23 "Hafnium Hornet" (go1.24.4 linux-amd64) debian@github.syncthing.net 2025-07-06 18:56:56 UTC [noupgrade, noupgrade]
[start] 2025/07/28 19:11:07 WARNING: Failed to acquire lock: is another Syncthing instance already running?
[monitor] 2025/07/28 19:11:07 INFO: Syncthing exited: exit status 1
[start] 2025/07/28 19:11:08 INFO: syncthing v2.0.0-rc.23 "Hafnium Hornet" (go1.24.4 linux-amd64) debian@github.syncthing.net 2025-07-06 18:56:56 UTC [noupgrade, noupgrade]
[start] 2025/07/28 19:11:08 WARNING: Failed to acquire lock: is another Syncthing instance already running?
[monitor] 2025/07/28 19:11:08 INFO: Syncthing exited: exit status 1
[start] 2025/07/28 19:11:09 INFO: syncthing v2.0.0-rc.23 "Hafnium Hornet" (go1.24.4 linux-amd64) debian@github.syncthing.net 2025-07-06 18:56:56 UTC [noupgrade, noupgrade]
[start] 2025/07/28 19:11:09 WARNING: Failed to acquire lock: is another Syncthing instance already running?
[monitor] 2025/07/28 19:11:09 INFO: Syncthing exited: exit status 1
[monitor] 2025/07/28 19:11:10 WARNING: 4 restarts in 4.089848102s; not retrying further

I installed Syncthing following these exact steps: https://apt.syncthing.net/. I already tried reinstalling it but it didn’t work. Any help would be appreciated!

2

Looks like Syncthing is already running. Check http://(device IP address):8384 and see if the UI comes up.

3

You can also try running ps aux | grep syncthing to check if it’s already running in the background. If it is, you might just need to stop the running process or reboot your system before starting it again.

4

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