Flathub使用Flatpak格式打包，它是一个第三方的应用程序库。如果你的Linux系统安装Flatpak后就可以启用Flathub了，它是托管Flatpak应用的集中地。目前GNOME 3.30桌面环境已作为Flatpak runtimes上架到Flathub中，从该网站可以下载安装GNOME 3.30到GNU/Linux发行版中。
在各大Linux发行版中安装Flatpak请参考：如何在Linux系统中安装Flatpak。如果你使用的是Fedora Workstation等版本已经默认安装了，启用Flathub就行了。支持的Linux发行版本相当多，比如深度操作系统、Ubuntu、Fedora、Linux Mint、OpenSUSE、Red Hat Enterprise Linux、CentOS、Arch Linux、Debian GNU/Linux、Gentoo Linux、Solus、Endless OS、Alpine Linux、Mageia、elementary、Raspbian和Pop!_OS等。
相关链接
Flathub说明：Apps for Linux, right here
欢迎来到Flathub，它是数百个应用程序的家，可以轻松安装在任何Linux发行版上。 在线浏览应用程序，从应用程序中心或命令行。
安装示例：
1.GIMP
flatpak install flathub org.gimp.GIMP
运行:
flatpak run org.gimp.GIMP
2.Vim
flatpak install flathub org.vim.Vim
运行:
flatpak run org.vim.Vim
3.Steam
flatpak install flathub com.valvesoftware.Steam
运行:
flatpak run com.valvesoftware.Steam
4.Shotwell
flatpak install flathub org.gnome.Shotwell
运行:
flatpak run org.gnome.Shotwell
5.GNOME Fonts
flatpak install flathub org.gnome.font-viewer
运行:
flatpak run org.gnome.font-viewer
6.RetroArch
flatpak install flathub org.libretro.RetroArch
运行:
flatpak run org.libretro.RetroArch
附：Gentoo使用flatpak
1、创建/etc/portage/repos.conf/flatpak-overlay.conf：
[flatpak-overlay]
priority = 50
location = /usr/local/portage/flatpak-overlay
sync-type = git
sync-uri = https://github.com/fosero/flatpak-overlay.git
auto-sync = Yes
2、emerge --sync然后emerge flatpak
3、从网络安装：
flatpak install --from https://flathub.org/repo/appstream/org.kicad_pcb.KiCad.flatpakref
4、从文件安装：
从app应用站点：https://flathub.org/ 找到app，下载.flatpakref安装
5、从repository安装
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub com.visualstudio.code
6、运行
flatpak run com.visualstudio.code
附：flathub内应用安装的正确方法
1.在flathub上面搜索应用并用提供命令安装后，一直会出现timeout，如下：
$ flatpak install --from https://flathub.org/repo/appstream/com.obsproject.Studio.flatpakref
error: Can't load uri https://flathub.org/repo/appstream/com.obsproject.Studio.flatpakref: Timeout was reached
2.经过不断的探索，发现安装runtime和sdk是没有问题，安装命令如下：
$ flatpak install flathub org.gnome.Platform//3.26
Installing: org.gnome.Platform/x86_64/3.26 from flathub
[####################] 10 delta parts, 11 loose fetched; 141642 KiB transferred in 65 seconds
Installing: org.gnome.Platform.Locale/x86_64/3.26 from flathub
[####################] 5 delta parts, 1 loose fetched; 20822 KiB transferred in 17 seconds
~$ flatpak install flathub org.gnome.Sdk//3.26
Installing: org.gnome.Sdk/x86_64/3.26 from flathub
[####################] 19 delta parts, 10 loose fetched; 144926 KiB transferred in 62 seconds
Installing: org.gnome.Sdk.Locale/x86_64/3.26 from flathub
[####################] 5 delta parts, 1 loose fetched; 4657 KiB transferred in 9 seconds
3.突发使用了下面这种方法安装应用，结果不出意外，完全可以成功：
~$ flatpak install flathub com.obsproject.Studio
Required runtime for com.obsproject.Studio/x86_64/stable (org.kde.Platform/x86_64/5.9) is not installed, searching...
Found in remote flathub, do you want to install it? [y/n]: y
Installing: org.kde.Platform/x86_64/5.9 from flathub
[####################] 12 delta parts, 40 loose fetched; 226536 KiB transferred in 189 seconds
Installing: org.kde.Platform.Locale/x86_64/5.9 from flathub
[####################] 5 delta parts, 9 loose fetched; 25758 KiB transferred in 69 seconds
Installing: com.obsproject.Studio/x86_64/stable from flathub
[####################] 1 delta parts, 7 loose fetched; 12324 KiB transferred in 21 seconds
Installing: com.obsproject.Studio.Locale/x86_64/stable from flathub
[####################] 1 delta parts, 1 loose fetched; 13 KiB transferred in 2 seconds
flatpak已更新到1.4.2