执行flatpak update时反复循环安装卸载19.08分支运行时如何解决

使用操作系统为Pop!_OS 21.04 x86_64，flatpak版本为1.11.2，运行flatpak update命令时，系统提示org.freedesktop.Platform.VAAPI.Intel、org.freedesktop.Platform.GL.default两个19.08分支的包已终止生命周期，会将其卸载；但下一次运行flatpak update命令时，又会自动重新安装这两个包，再下一次运行又会卸载，循环出现。
对应执行日志如下：

agamagarwal@glados:~$ flatpak update
Looking for updates…
Info: org.freedesktop.Platform.VAAPI.Intel//19.08 is end-of-life, with reason:
   The Freedesktop SDK 19.08 runtime is no longer supported as of September 1, 2021. Please ask your application developer to migrate to a supported version
Info: org.freedesktop.Platform.GL.default//19.08 is end-of-life, with reason:
   The Freedesktop SDK 19.08 runtime is no longer supported as of September 1, 2021. Please ask your application developer to migrate to a supported version


        ID                                            Branch          Op
 1. [-] org.freedesktop.Platform.GL.default           19.08           r
 2. [-] org.freedesktop.Platform.VAAPI.Intel          19.08           r

Uninstall complete.
agamagarwal@glados:~$ flatpak update
Looking for updates…
Info: org.freedesktop.Platform.VAAPI.Intel//19.08 is end-of-life, with reason:
   The Freedesktop SDK 19.08 runtime is no longer supported as of September 1, 2021. Please ask your application developer to migrate to a supported version
Info: org.freedesktop.Platform.GL.default//19.08 is end-of-life, with reason:
   The Freedesktop SDK 19.08 runtime is no longer supported as of September 1, 2021. Please ask your application developer to migrate to a supported version


        ID                                              Branch            Op           Remote            Download
 1. [✓] org.freedesktop.Platform.GL.default             19.08             i            flathub           88.6 MB / 89.1 MB
 2. [✓] org.freedesktop.Platform.VAAPI.Intel            19.08             i            flathub            8.6 MB / 8.7 MB

Installation complete.

这一循环现象的本质是：设备上安装的某款/多款Flatpak应用仍依赖已停止维护的19.08分支Freedesktop运行时扩展。flatpak update执行时会先清理无主动引用的终止生命周期（EOL）包，检测到应用依赖后又会自动重新安装缺失的依赖，就会出现反复卸载重装的情况。

• 第一步：定位依赖旧版本运行时的应用
  执行以下命令查询依赖19.08分支对应扩展的应用：

  flatpak dependency-tree --runtime org.freedesktop.Platform.VAAPI.Intel//19.08
  flatpak dependency-tree --runtime org.freedesktop.Platform.GL.default//19.08
  

• 第二步：根据查询结果处理对应应用
  • 若查询到的应用有可用更新，优先升级对应应用：大部分应用的最新版本已经迁移到了更高版本的受支持Freedesktop运行时，升级后就不再依赖19.08分支的扩展，循环问题会自动消失。
  • 若应用已停止维护没有可用更新，可以选择卸载该废弃应用，彻底消除旧版本依赖。
  • 若需要保留该应用，可以执行以下命令屏蔽这两个包的更新动作，避免反复卸载重装：

    flatpak mask org.freedesktop.Platform.VAAPI.Intel//19.08 org.freedesktop.Platform.GL.default//19.08
    

    后续不需要屏蔽时执行对应flatpak unmask命令即可解除限制。

注意：不要直接强制卸载这两个运行时扩展，否则依赖它的应用会出现启动失败、功能异常等问题。

内容的提问来源于stack exchange，提问作者agamagarwal