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如何锁定我的屏幕?

我无法在笔记本电脑和 PC 中启用锁屏模式。我去了系统设置 > 屏幕 > 锁定 Ctrl+Alt+L :没有任何反应!捷径在那里,但不起作用!

sudo apt-get --reinstall install gnome-screensaver :
Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 dassault-systemes-draftsight:i386 : Depends: sendmail:i386 but it is not installable
                                     PreDepends: libdirectfb-extra:i386 (>= 1.2.7-2) but it is not going to be installed
                                     PreDepends: libxcb-render-util0:i386 (>= 0.3.6-1) but it is not installable
E: Unmet dependencies. Try 'apt-get -f install' …
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lock-screen 11.10

11
推荐指数
3
解决办法
4万
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