#flatpak list
Name Application ID Version Branch Installation
Authenticator com.github.bilelmoussaoui.Authenticator 3.32.2 stable system
Skype com.skype.Client 8.51.0.72 stable system
Freedesktop.org Application Platform version 1.6 org.freedesktop.Platform 1.6 1.6 system
Freedesktop Platform org.freedesktop.Platform 18.08.37 18.08 system
Freedesktop Platform org.freedesktop.Platform 19.08.3 19.08 system
default org.freedesktop.Platform.GL.default 19.08 system
nvidia-340-107 org.freedesktop.Platform.GL.nvidia-340-107 1.4 system
FFmpeg extension org.freedesktop.Platform.ffmpeg 1.6 system
html5-codecs org.freedesktop.Platform.html5-codecs 18.08 system
openh264 org.freedesktop.Platform.openh264 19.08 system
GNOME Application Platform version 3.34 org.gnome.Platform 3.34 system
Breeze Gtk theme org.gtk.Gtk3theme.Breeze 3.22 system
我可以卸载 Freedesktop.org 平台版本 1.6 和另外两个 Freedesktop 平台之一（哪一个？）而不破坏任何依赖关系吗？
编辑：
~$ sudo flatpak remove --unused
ID Arch Branch
1. [-] org.freedesktop.Platform.ffmpeg x86_64 1.6
2. [-] org.freedesktop.Platform x86_64 1.6
3. [-] org.freedesktop.Platform.Locale x86_64 1.6
4. [-] org.freedesktop.Platform x86_64 19.08
5. [-] org.freedesktop.Platform.Locale x86_64 19.08
Uninstall complete.
error: Refusing to operate on a user installation as root! This can lead to incorrect file ownership and permission errors.
~$ flatpak remove --unused
Nothing unused to uninstall
编辑2：
$ flatpak update
Looking for updates…
Required runtime for org.freedesktop.Platform.GL.nvidia-340-107/x86_64/1.4 (runtime/org.freedesktop.Platform/x86_64/1.6) found in remote flathub
Do you want to install it? [Y/n]: y
ID Arch Branch Op Remote Download
1. [✓] org.freedesktop.Platform x86_64 1.6 i flathub 184,4 MB / 395,4 MB
2. [✓] org.freedesktop.Platform.ffmpeg x86_64 1.6 i flathub 2,9 MB / 2,9 MB
3. [✓] org.freedesktop.Platform.Locale x86_64 1.6 i flathub 620,0 kB / 177,1 MB
4. [✓] org.gnome.Platform x86_64 3.34 u flathub 253,8 kB / 318,4 MB
5. [✓] org.gnome.Platform.Locale x86_64 3.34 u flathub 1.0 kB / 322,7 MB
Changes complete.
$ flatpak remove --unused
ID Arch Branch
1. [-] org.freedesktop.Platform.ffmpeg x86_64 1.6
2. [-] org.freedesktop.Platform x86_64 1.6
3. [-] org.freedesktop.Platform.Locale x86_64 1.6
Uninstall complete.
$ flatpak remove --unused
Nothing unused to uninstall
$ flatpak update
Looking for updates…
Required runtime for org.freedesktop.Platform.GL.nvidia-340-107/x86_64/1.4 (runtime/org.freedesktop.Platform/x86_64/1.6) found in remote flathub
Do you want to install it? [Y/n]: y
ID Arch Branch Remote Download
1. [✓] org.freedesktop.Platform x86_64 1.6 flathub 184,4 MB / 395,4 MB
2. [✓] org.freedesktop.Platform.ffmpeg x86_64 1.6 flathub 2,9 MB / 2,9 MB
3. [✓] org.freedesktop.Platform.Locale x86_64 1.6 flathub 620,0 kB / 177,1 MB
Installation complete.
$ flatpak remove --unused
ID Arch Branch
1. [-] org.freedesktop.Platform.ffmpeg x86_64 1.6
2. [-] org.freedesktop.Platform x86_64 1.6
3. [-] org.freedesktop.Platform.Locale x86_64 1.6
Uninstall complete.
$ flatpak update
Looking for updates…
Required runtime for org.freedesktop.Platform.GL.nvidia-340-107/x86_64/1.4 (runtime/org.freedesktop.Platform/x86_64/1.6) found in remote flathub
Do you want to install it? [Y/n]:
ID Arch Branch Remote Download
1. [✓] org.freedesktop.Platform x86_64 1.6 flathub 184,4 MB / 395,4 MB
2. [✓] org.freedesktop.Platform.ffmpeg x86_64 1.6 flathub 2,9 MB / 2,9 MB
3. [✓] org.freedesktop.Platform.Locale x86_64 1.6 flathub 620,0 kB / 177,1 MB
Installation complete.
答案1
您拥有多个版本的（运行时）软件包的原因是，您安装的应用程序（无论如何，一次安装）与不同的版本捆绑在一起。例如，Skype应用程序使用org.freedesktop.平台/x86_64/18.08版本，如下所示：
$ flatpak info com.skype.Client
Skype - Call and message skype users, with video chat support
ID: com.skype.Client
Ref: app/com.skype.Client/x86_64/stable
Arch: x86_64
Branch: stable
Version: 8.51.0.72
License: LicenseRef-proprietary
Collection: org.flathub.Stable
Download: 1.4 MB
Installed: 3.6 MB
Runtime: org.freedesktop.Platform/x86_64/18.08
Sdk: org.freedesktop.Sdk/x86_64/18.08
Commit: 33d87117f3d06e0e91bc47bc4d8f588707817bfb278312778f9621a75ed76acd
Parent: 3c349350580315d12c7038848a1077c0d9bfdf2ae34c77109935b559a20caebf
Subject: Revert "Update skypeforlinux-64.deb to 8.51.0.92" (bc3e41a3)
Date: 2019-09-02 11:15:01 +0000
有时，Flatpak 不太擅长自行清理。我的系统有 (3) 个您提到的运行时版本，目前都在使用中。您可以尝试运行flatpak remove --unused，它是应该卸载任何不应该存在的软件包，但这种方法并不 100% 可靠。如果您不小心删除了安装所需的运行时，它将在系统下次运行 Flatpak 维护或您flatpak update手动运行时得到修复。
答案2
理想情况下，您可以卸载 freedesktop。我确信您所要做的就是安装 GNOME 软件管理器并从那里管理这些应用程序。不过，我对 Chrome OS 和 Mac OSX 的了解比 Xfce4 多。
抱歉，如果我帮不上忙。我做些研究后也许能给你更好的答案。