The ‘appstore’ of some distributions, e.g. Linux Mint, displays a warning or hint for unofficial flatpaks. In Mint the display of unofficial flatpaks are toggled off by default and there is a warning or recommendation displayed against toggling on.

Seconded. I use Debian with KDE btw ;-)

That’s odd. I hate closed eco systems.

If proton supports CalDAV (I’m not sure), it should work e.g. with DAVx5 which integrates well with Android calendar.

I think it’s about the privacy being harmed when needing to login, e.g. for bug reporting and working with the source code by means oft GitHub, not for the passive part of just downloading the source for local use.

What you are intending to do is cross-compiling. Maybe this resource is useful for you.

When I had the issue with mariadb demon been killed, I think either in dmesg or syslog there was an entry reading "Out of memory: Kill process… " or similar.

In principle any DAV client should work. On Android, I use DAVx5 and Tasks.org to access my Nextcloud. On Thunderbird + Lightning, you can e.g. use SOGo connector or TbSync to use the address books, calendars and tasks.

Then, maybe, Baikal a Cal-/ Card-DAV server is what you are searching for.

That would not be equivalent to ‘remote location’, as the files would be stored locally on your computer and being synced with the cloud.

The title states:

Attempting to use Home Assistant OS

So OP uses the preconfigured “ready to go” solution with the supervisor doing the setup and upgrades. Which somehow is not succesfull in doing so.

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