I've tried to update the Arma 3 Linux Server via the steamcmd.sh line. I logged in and tried to update with the command

force_install_dir ./<pathtoarma3server>
app_update 233780 validate

local (potentially out of sync) copy of roaming config loaded - 1805 bytes.
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Update state (0x3) reconfiguring, progress: 0,00 (0 / 0)
Error! App '233780' state is 0x6 after update job.

so Arma 3 wasn't updated. The Version doesn't change.