Ubuntu 24.04虚拟机解锁桌面后GUI大面积冻结问题求助

大家好，我是个新手，在Windows 10上用VirtualBox装了Ubuntu 24.04虚拟机，已经装好Guest Additions，也把24.04的所有系统更新都更完了。

最近碰到个麻烦：我离开电脑后系统会自动锁屏，解锁之后桌面基本就冻住了——鼠标键盘虽然还能正常操作，但之前打开的应用完全切换不了；Dash里只显示Show apps图标，点进去能看到应用列表，但不管点哪个应用都启动不了。

下面是日志里的关键条目：

15:37:49 systemd: Failed to start app-gnome-ubuntu\x2dreport\x2don\x2dupgrade-247391.scope - Application launched by gnome-session-binary.
15:37:46 gdm-session-wor: gkr-pam: unable to locate daemon control file
13:33:28 systemd: Failed to start app-gnome-spice\x2dvdagent-142801.scope - Application launched by gnome-session-binary.
13:33:26 gdm-session-wor: gkr-pam: unable to locate daemon control file
11:02:53 hpfax: [5959...

备注：内容来源于stack exchange，提问作者Mike G