Can not install libthemis-dev on Ubuntu 22.04.1 LTS

[radetsky]

Used instructions from docs.cossacklabs.com to install the core library into fresh installed Ubuntu 22.04.01 LTS.

To Reproduce
Steps to reproduce the behavior:

1. Install Ubuntu 22.04 LTS
2. Run 'wget -qO - https://pkgs-ce.cossacklabs.com/gpg | sudo apt-key add -'
3. See the following error:

Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).

4. Add 'deb https://pkgs-ce.cossacklabs.com/stable/ubuntu jammy main' to /etc/apt/sources.list.d/cossacklabs.list
5. Run 'apt-get update'
6. See the following error:

root@my.project.com:/etc/apt/sources.list.d# apt-get update
Hit:1 http://mirrors.digitalocean.com/ubuntu jammy InRelease
Hit:2 https://repos-droplet.digitalocean.com/apt/droplet-agent main InRelease
Hit:3 http://mirrors.digitalocean.com/ubuntu jammy-updates InRelease
Hit:4 http://mirrors.digitalocean.com/ubuntu jammy-backports InRelease
Ign:5 https://pkgs-ce.cossacklabs.com/stable/ubuntu jammy InRelease
Err:6 https://pkgs-ce.cossacklabs.com/stable/ubuntu jammy Release
  404  Not Found [IP: 178.63.6.189 443]
Get:7 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Reading package lists... Done
E: The repository 'https://pkgs-ce.cossacklabs.com/stable/ubuntu jammy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Expected behavior
Adding the key without warning and installing the package by a package manager.

Environment (please complete the following information):

• OS: Ubuntu 22.04.01 LTS
• Hardware: [x86-64, Digital Ocean Droplet]
• Themis version: [e.g. 0.14.0]
• Installation way:
  • via package manager
  • built from source

[vixentael]

I guess it's because Ubuntu 22.04 is not in the list of supported distributives yet :)

You are always welcome to install via code:
https://docs.cossacklabs.com/themis/installation/installation-from-sources/

We will build Themis on 22.04 soon.