Support for Debian 13 Trixie

[ItachiSan]

Is your feature request related to a problem? Please describe.
No myst package is available for Debian Trixie in the official repo:
https://launchpad.net/~mysteriumnetwork/+archive/ubuntu/node/+packages
The script defaults to focal. noble last builds are broken.

See versions mapping here:
https://askubuntu.com/a/445496

Describe the solution you'd like
The PPA contains a package matching Debian 13.

Describe alternatives you've considered
I could fix the package myself, but I am unsure where the package sources are.

Additional context
None for now.
If you need additional context, I will gladly provide.

[NexusAndromeda]

There's also a GPG key issue: on Debian Trixie, apt rejects the repository because the signing key uses SHA1, which was deprecated in February 2026. The error is: Policy rejected ... SHA1 is not considered secure since 2026-02-01. This blocks installation even when using the focal repo. The DEB package from GitHub Releases works as a workaround, but without automatic updates.

[ItachiSan]

Any progress?

[ItachiSan]

Update: got it to work with some experiments.

I believe the current documentation needs updates.
The recommended focal distribution is applicable for Debian 12 (maybe?), but for 13 noble should be used.

The following steps are reconstructed from:
https://github.com/mysteriumnetwork/node/blob/master/install.sh

1. Fetch the PPA key:

   # Script dearmors this, but it is fine as long as the extension is .asc
   curl -fsSL https://ppa.mysterium.network/public-key | sudo tee /etc/apt/keyrings/mysterium.asc

2. Update /etc/apt/sources.list.d/mysterium.list with this content

   deb [signed-by=/etc/apt/keyrings/mysterium.asc] https://ppa.mysterium.network/mysteriumnetwork/node/ubuntu noble main
   

Finally update and upgrade should work.

Before this, I did upgrade my Debian 12 / OpenMediaVault 7 installation via omv-release-upgrade.
In this way, I got Debian 13 + OMV 8.
Finally, did the steps above and got the node software finally updated.