Action does not seem to work on ubuntu-slim runner #286

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1. jaxxstorm commented on Apr 25, 2026

   

   jaxxstorm

   on Apr 25, 2026

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   I did a little bit of an investigation into this, and came to the conclusion this fails because ubuntu-slim is a docker like/or containerized environment.

   If you try and start tailscaled manually, you see that there's no iptables binary and you can't create a TUN device

   Run echo "=== Attempting to start tailscaled manually ==="
   === Attempting to start tailscaled manually ===
   Started tailscaled with PID: 619
   TPM: error opening: stat /dev/tpmrm0: no such file or directory
   2026/04/25 16:12:45 logtail started
   2026/04/25 16:12:45 Program starting: v1.96.4-t8cf541dfd-g62bc84ce7, Go 1.26.1: []string{"/usr/local/bin/tailscaled", "--state=/var/lib/tailscale/tailscaled.state", "--socket=/var/run/tailscale/tailscaled.sock"}
   2026/04/25 16:12:45 LogID: 814df802a432d767388ba667d1fd12eb3c9910f4f75d803f0028bf9b3b364b07
   2026/04/25 16:12:45 logpolicy: using system state directory "/var/lib/tailscale"
   2026/04/25 16:12:45 dns: [rc=unknown ret=direct]
   2026/04/25 16:12:45 dns: using "direct" mode
   2026/04/25 16:12:45 dns: using *dns.directManager
   2026/04/25 16:12:45 linuxfw: clear iptables: exec: "iptables": executable file not found in $PATH
   2026/04/25 16:12:45 linuxfw: clear ip6tables: exec: "ip6tables": executable file not found in $PATH
   2026/04/25 16:12:45 cleanup: list tables: netlink receive: operation not permitted
   2026/04/25 16:12:45 dns: inotify: NewDirWatcher: context canceled
   2026/04/25 16:12:45 wgengine.NewUserspaceEngine(tun "tailscale0") ...
   2026/04/25 16:12:45 Linux kernel version: 6.1.146.1-microsoft-standard
   2026/04/25 16:12:45 is CONFIG_TUN enabled in your kernel? `modprobe tun` failed with: 
   2026/04/25 16:12:45 tun module not loaded nor found on disk
   2026/04/25 16:12:45 wgengine.NewUserspaceEngine(tun "tailscale0") error: tstun.New("tailscale0"): CreateTUN("tailscale0") failed; /dev/net/tun does not exist
   2026/04/25 16:12:45 flushing log.
   2026/04/25 16:12:45 logger closing down
   2026/04/25 16:12:45 getLocalBackend error: createEngine: tstun.New("tailscale0"): CreateTUN("tailscale0") failed; /dev/net/tun does not exist
   
   === Checking if process is still running ===
     PID TTY          TIME CMD
   Process 619 is not running
   
   === Checking socket ===
   ls: cannot access '/var/run/tailscale/tailscaled.sock': No such file or directory
   Socket still not created
   
   === Trying to get status ===
   failed to connect to local tailscaled; it doesn't appear to be running (sudo systemctl start tailscaled ?)
   Failed to get status
   

   You can update the args if you want to run in userspace mode:

   tailscaled-args: --tun=userspace-networking
   args: --accept-dns=false
   

   But it will be functionally very limited in usability, because you'll need to configure a SOCKS proxy for all connectivity requirements. As a result, I think we should just document that ubuntu-slim doesn't work and leave it at that

   👍React with 👍1Reacted by robyn