Official Flatpak support on Linux
Flatpak is a modern packaging format for Linux distributions, with the advantages of:
- working consistently across a wide array of distributions (thus making it much easier for developers to support any Linux distro)
- relative independence from the underlying system, making it the only distribution channel for immutable distros like Fedora Silverblue and Steam OS
- higher security due to its sandboxing
As such, it'd be great if it was officially supported by Proton for all its native applications.
It's true that the sandbox could potentially pose some limits to the app that might not be solvable via portals yet, but fortunately, portals can be proposed by the community — so Proton could actively help move the Flatpak ecosystem forward!
Proton's been able to support a range of other operating systems that also sandbox apps in one way or another, so it should be able to support sandboxed Flatpaks on Linux too.

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Jeremy Justus commented
Adding another voice in favor of this. There is a wide ecosystem of Linux distributions that are not downstream of Redhat or Debian, and an official flatpak release is an easy way of providing Proton apps to a large number of them.
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Patrick commented
Please do this
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stegosaur commented
Please do this.
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Anonymous commented
This feature is such in demand that users started to create flatpak packages themselves. Of course, I would only trust the official one.
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Privacy commented
CRITICAL
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Tim Rogers commented
This would be great - especially if ARM was also supported.
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Thomas commented
Flatpak is the way to go here, guaranteeing compatibility on multiple distros.
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protonSuggestions commented
I too would love to see verified Flatpaks on Flathub for all Linux programmes of Proton!
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Anonymous commented
Agree, verified Flatpak would be extremely helpful for using Protonmail App across various Linux distros.
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SomebodyNose commented
It's ok if you want to create and maintain a Flatpak, but not at the expense of rpm/deb packages, which are never going away.
Personally, I'd rather see a dnf and apt repo for installation/updating so I have one update mechanism on my system. I'd rather avoid the mess of requiring up to four different ways for updating my system: dnf/apt + Snap/Flatpak/AppImage.
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Damerlen commented
Flatpaks for VPN and Drive please
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Anonymous commented
Having Flatpaks for Proton applications would be such a huge step forward for Linux users. While having RPM and DEB packages is nice, this leaves other more niche distros out to dry. Additionally, Flatpak support would allow users of immutable distros to actually use Proton applications without needing to trust the unofficial third-party Flatpaks that exist today.
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[Deleted User] commented
As other users have already said, Proton should just publish their programs as Flatpaks if they want to properly support Linux. Not everybody uses Fedora or Debian and Flatpak provides a sandbox and thus better security.
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Lukas commented
Proton should just publish their apps as flatpaks. Not only are they more secure and isolated, but they also work on all distributions. Some of us use openSUSE, Arch, and other distributions that aren't Fedora or Debian.
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Vejbred commented
I would really like the Proton calendar/ mail app supported as a flatpak instead of the .rpm and .deb file. Would be much easier across distros
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Hugo commented
This would be great to have for the proton mail app too, as it would make installs for many Linux distros a lot easier
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Matej commented
These days it is very common to package applications across linux distros into flatpaks or AppImages as its easier to maintain as current state where is only avalible for RHEL/Fedora, debian, no arch support
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Samir commented
This! While there are community flatpaks for the mail bridge and VPN, I would much prefer official and verified flatpaks directly from Proton.
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JWF commented
I give full support for this idea. In order to achieve adoption in the Linux desktop market, it is not enough to only provide RPMs and DEBs anymore. The emerging containerized environments for securely running sandboxed desktop apps are attractive for security and privacy reasons. To win the RPM market, you need Flatpak/Flathub. To win the DEB market, you likely need Canonical Snaps. As a Fedora Linux user, I give my full support to Flatpaks because this would enable me to adopt Proton Mail for Linux as a daily desktop app. I will likely not install it on bare metal, even though I could, because sometimes I need to access my email in an environment where I am not always `root` or have sudoer privileges to install new software.