我昨晚从 DVD 安装了 Ubuntu 18.04。
我添加了一些基本组件，如 gcc、make、build-essential、manpages-dev、dkms、git、wifi 驱动程序（使用 dkms）、curl、gnupg、brave-browser 和 Steam。然后今天尝试通过软件更新程序 GUI 将操作系统升级到版本 20.04。它已经到了“安装升级”
“焦点”窗口显示：
Unpacking libselinux1 (amd64)
并在下面的终端中：
Preparing to unpack .../libpam0g_1.3.1-5ubuntu4.1_amd64.deb ...
Unpacking libpam0g:amd64 (1.3.1-5ubuntu4.1) over (1.1.8-3.6ubuntu2.18.04.2) ...
Setting up libpam0g:amd64 (1.3.1-5ubuntu4.1) ...
Fontconfig warning: "/etc/fonts/conf.avail/53-monospace-lcd-filter.conf", line 10: Having multiple values in <test> isn't supported and may not work as expected
Checking for services that may need to be restarted...Checking init scripts...```
var/log/dist-upgrade/main.log:
```2021-01-12 14:37:10,612 DEBUG demoted: 'libdbusmenu-gtk4 libegl1-mesa libllvm6.0'
2021-01-12 14:37:10,612 DEBUG found components: {'focal': {'main', 'universe', 'restricted', 'multiverse'}, 'focal-updates': {'main', 'universe', 'restricted', 'multiverse'}, 'focal-security': {'main', 'universe', 'restricted', 'multiverse'}}
2021-01-12 14:37:10,616 DEBUG quirks: running StartUpgrade
2021-01-12 14:37:10,616 DEBUG running Quirks.StartUpgrade
2021-01-12 14:37:10,616 DEBUG skipping 'README' (no '.')
2021-01-12 14:37:10,616 DEBUG killing update-notifier
2021-01-12 14:37:10,633 DEBUG killing kblueplugd kbluetooth4
2021-01-12 14:37:10,651 DEBUG killing gnome-screensaver
2021-01-12 14:37:10,671 DEBUG setup poke timer for the screensaver
2021-01-12 14:37:10,684 INFO cache.commit()
2021-01-12 14:44:09,474 WARNING no activity on terminal for 300 seconds (Unpacking libselinux1 (amd64))
左侧有一个名为“前端”的窗口，上面写着“配置 libpamOg：amd64”，并且有一个复选框，上面写着“在软件包升级期间重新启动服务而不询问？” 切换它没有任何作用。
我无法打开“文件”应用程序和系统设置应用程序。
我现在应该怎么做？