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我会用USB来锁定和解锁我的Ubuntu与pamusb，但问题是，当我插入USB它不会解锁屏幕，而在日志中说它是解锁的：Pamusb代理说解锁，但屏幕仍然锁定
pamusb-agent[6707]: pamusb-agent up and running.
pamusb-agent[6707]: Watching device "USBKEY" for user "ubuntuuser"
pamusb-agent[6707]: Device "USBKEY" has been removed, locking down user "ubuntuuser"...
pamusb-agent[6707]: Running "gnome-screensaver-command -l"
pamusb-agent[6707]: Locked.
pamusb-agent[6707]: Device "USBKEY" has been inserted. Performing verification...
pamusb-agent[6707]: Executing "/usr/bin/pamusb-check --quiet --config=/etc/pamusb.conf --service=pamusb-agent ubuntuuser"
pamusb-agent[6707]: Authentication succeeded. Unlocking user "ubuntuuser"...
pamusb-agent[6707]: Running "gnome-screensaver-command -d"
pamusb-agent[6707]: Unlocked.
锁定无缝工作，问题只与解锁阶段。