我在離線機器上運行 Ubuntu 20.04。最近，顯示連接埠視訊輸出已停止運作，僅顯示空白螢幕，左上角有閃爍的下劃線。我仍然可以使用 存取終端Ctrl+Alt+F2。當我查看系統日誌時，我看到以下錯誤：
Feb 21 07:38:35 sdrdev2 org.gnome.OnlineAccounts[2227]: /usr/libexec/goa-daemon: symbol lookup error: /lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37: undefined symbol: cairo_font_options_set_variations
Feb 21 08:54:19 sdrdev2 systemd[1]: Condition check resulted in Process error reports when automatic reporting is enabled (file watch) being skipped.
Feb 21 08:54:19 sdrdev2 kernel: [ 0.605284] pcieport 0000:00:1c.5: DPC: error containment capabilities: Int Msg #0, RPExt+ PoisonedTLP+ SwTrigger+ RP PIO Log 4, DL_ActiveErr+
Feb 21 08:54:19 sdrdev2 kernel: [ 0.606839] ACPI Error: Aborting method \_SB.PR01._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.606919] ACPI Error: Aborting method \_SB.PR02._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.606999] ACPI Error: Aborting method \_SB.PR03._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.607071] ACPI Error: Aborting method \_SB.PR04._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.607143] ACPI Error: Aborting method \_SB.PR05._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.607216] ACPI Error: Aborting method \_SB.PR06._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 0.607291] ACPI Error: Aborting method \_SB.PR07._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529)
Feb 21 08:54:19 sdrdev2 kernel: [ 2.997692] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro. Quota mode: none.
Feb 21 08:54:20 sdrdev2 gnome-session[835]: gnome-session-binary[835]: WARNING: Falling back to non-systemd startup procedure due to error: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
Feb 21 08:54:20 sdrdev2 gnome-session-binary[835]: WARNING: Falling back to non-systemd startup procedure due to error: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
Feb 21 08:54:20 sdrdev2 org.gnome.OnlineAccounts[878]: /usr/libexec/goa-daemon: symbol lookup error: /lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37: undefined symbol: cairo_font_options_set_variations
Feb 21 08:54:20 sdrdev2 /usr/lib/gdm3/gdm-x-session[948]: #011(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
Feb 21 08:54:21 sdrdev2 gnome-session[957]: libGL error: MESA-LOADER: failed to open swrast: /usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri, suffix _dri)
其中根據版本升級後 Ubuntu 啟動黑屏並閃爍下劃線字符是一個gdm3相關的問題。
我嘗試了很多方法，例如取消註釋Wayland Enable=False，我也使用過sudo dpkg-reconfigure gdm3，sudo service gdm3 restart但沒有改變。
我的下一個行動計劃是使用 USB 驅動器重新安裝 gdm3 - 在我完成收集所有依賴項的過程之前，是否有人對如何解決缺少視訊輸出的問題有其他建議？ （是的，我已經排除了顯示器或電纜損壞的可能性）