This error typically occurs when Brave Browser detects that its profile is already in use by another instance of Brave running on a different computer, which prevents it from launching to prevent corruption. Here’s how you can resolve this issue on Fedora:
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Kill the existing Brave processes (if any): Open a terminal and run the following command to list all Brave processes:
perl aux | grep brave-browser
This will show you a list of processes related to Brave. Look for any processes that are still running and note down their process IDs (PIDs). For example: