官方教程：

https://flathub.org/setup/Deepin

root@ee:/home/ee# sudo apt install flatpak
正在读取软件包列表... 完成
正在分析软件包的依赖关系树... 完成
正在读取状态信息... 完成
flatpak 已经是最新版 (1.14.10-1)。
下列软件包是自动安装的并且现在不需要了：
aria2 boot-info-script coinor-libcbc3 coinor-libcgl1 coinor-libclp1 coinor-libcoinmp1v5 coinor-libcoinutils3v5
coinor-libosi1v5 dde-cooperation-daemon dde-cooperation-transfer deepin-default-settings-tuning fonts-opensymbol inxi
libabw-0.1-1 libaria2-0 libatkmm-1.6-1v5 libboost-locale1.83.0 libbox2d2 libc-ares2 libcairomm-1.0-1v5 libcdr-0.1-1
libclucene-contribs1v5 libclucene-core1v5 libcmis-0.6-6 libcolamd3 libdjvulibre-text libdjvulibre21 libdlmaria2
libdlmcontrolui libdlmdatabase libdlmlog libe-book-0.1-1 libeot0 libepubgen-0.1-1 libetonyek-0.1-1 libexttextcat-2.0-0
libexttextcat-data libfreehand-0.1-1 libgtkmm-3.0-1v5 libhandy-1-0 libieee1284-3 liblangtag-common liblangtag1 libmhash2
libmspub-0.1-1 libmwaw-0.3-3 libmythes-1.2-0 libntfs-3g89 libnumbertext-1.0-0 libnumbertext-data libodfgen-0.1-1
liborcus-0.18-0 liborcus-parser-0.18-0 libpagemaker-0.0-0 libpangomm-1.4-1v5 libqxp-0.0-0 librasqal3 librdf0
librevenge-0.0-0 libsane-common libsane1 libsnmp-base libsnmp40 libstaroffice-0.0-0 libsuitesparseconfig7 libuno-cppu3
libuno-cppuhelpergcc3-3 libuno-purpenvhelpergcc3-3 libuno-sal3 libuno-salhelpergcc3-3 libvisio-0.1-1 libwpd-0.10-10
libwpg-0.3-3 libwps-0.4-4 libxmlsec1-nss libzmf-0.0-0 libzxcvbn0 lp-solve sqlite3 uno-libs-private ure
使用'sudo apt autoremove'来卸载它(它们)。
升级了 0 个软件包，新安装了 0 个软件包，要卸载 0 个软件包，有 108 个软件包未被升级。
root@ee:/home/ee# flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
root@ee:/home/ee# flatpak install flathub org.gtk.Gtk3theme.deepin
flatpak install flathub org.gtk.Gtk3theme.deepin-dark
寻找匹配项…
正在跳过：org.gtk.Gtk3theme.deepin/x86_64/3.22 已安装
寻找匹配项…
正在跳过：org.gtk.Gtk3theme.deepin-dark/x86_64/3.22 已安装

root@Iresee:/home/ee# flatpak install flathub com.plexamp.Plexamp
寻找匹配项…
正在跳过：com.plexamp.Plexamp/x86_64/stable 已安装

root@ee:/home/Iresee# flatpak run com.plexamp.Plexamp
Passing the following arguments to Electron: --enable-gpu-rasterization --enable-zero-copy --enable-gpu-compositing --enable-native-gpu-memory-buffers --enable-oop-rasterization --disable-gpu-blocklist --enable-features=UseSkiaRenderer
[3 zypak-helper] Failed to connect to session bus: [org.freedesktop.DBus.Error.Spawn.ExecFailed] /usr/bin/dbus-launch terminated abnormally without any error message
[3 zypak-helper] src/helper/main.cc:42(DetermineZygoteStrategy): Assertion failed: bus
/app/bin/startplexamp: 第 29 行： 3 已放弃 zypak-wrapper /app/bin/plexamp/plexamp "​{FLAGS[@]}" "@"