Ubuntu – How to install TortoiseHg on ubuntu 19.10

I just tried to install TortoiseHg after updating from Ubuntu 19.04 to Ubuntu 19.10 and I've got the following:

sudo apt install tortoisehg 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package tortoisehg is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'tortoisehg' has no installation candidate

Is there at the moment any option of installing TortoiseHg except for building it on my own from sources?

Regarding the comment about possible duplicate of Installing TortoiseHg: need higher Mercurial version – it doesn't solve the issue.

Currently I'm using mercurial in version 4.8.2 which is the newest available in 19.10 without adding mercurial-ppa.

When I tried to add the mercurial-ppa, I've got the following error:

sudo add-apt-repository ppa:mercurial-ppa/releases
 See https://launchpad.net/~mercurial-ppa
 More info: https://launchpad.net/~mercurial-ppa/+archive/ubuntu/releases
Press [ENTER] to continue or Ctrl-c to cancel adding it.

Ign:1 http://ppa.launchpad.net/mercurial-ppa/releases/ubuntu eoan InRelease
Err:2 http://ppa.launchpad.net/mercurial-ppa/releases/ubuntu eoan Release                                                                
  404  Not Found [IP: 91.189.95.83 80]
Hit:3 http://security.ubuntu.com/ubuntu eoan-security InRelease                                                                                                                                        
Hit:4 http://nl.archive.ubuntu.com/ubuntu eoan InRelease                                                                                                                                               
Hit:5 http://nl.archive.ubuntu.com/ubuntu eoan-updates InRelease                                                                                                   
Hit:6 https://repo.skype.com/deb stable InRelease                                                                          
Hit:7 http://nl.archive.ubuntu.com/ubuntu eoan-backports InRelease                                                         
Ign:8 http://dl.google.com/linux/chrome/deb stable InRelease                                         
Ign:9 http://dl.google.com/linux/earth/deb stable InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Hit:11 http://dl.google.com/linux/earth/deb stable Release
Hit:12 https://dl.winehq.org/wine-builds/ubuntu eoan InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/mercurial-ppa/releases/ubuntu eoan 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.