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<meta http-equiv="X-UA-Compatible" content="IE=edge"><title>Why is Tmux crashing on start? - Brainsteam</title><meta name="viewport" content="width=device-width, initial-scale=1">
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<h1 class="title">Why is Tmux crashing on start?</h1>
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<p>I spent several hours trying to get to the bottom of why tmux was crashing as soon as I ran it on Fedora. It turns out there’s a simple fix. When tmux starts it uses /dev/ptmx to create a new TTY (virtual terminal) that the user can interact with. If your user does not have permission to access this device then tmux will silently die. A good way to verify this is to try running <a href="https://en.wikipedia.org/wiki/GNU_Screen">screen</a> too.</p>
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<p>In my case I realised that my user was not a member of the user group “tty” on my system. The answer was therefore simple:</p>
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<pre>sudo usermod -a -G tty james</pre>
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<p>I hope this helps someone avoid spending hours searching for the right incantation.</p>
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<li><a href="/tags/tmux">tmux</a></li>
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