@Michal I realise what you are saying. But…
actually reading UrBackup docs
Yes, these plainly state:
2.1.2 Server installation on Ubuntu
Install the UrBackup Server via running following commands:
sudo add-apt-repository ppa:uroni/urbackup
sudo apt-get update
sudo apt-get install urbackup-server
previous answers in this thread
The previous answers on this thread are not clear - nowhere in this thread does it clearly state what to do.
And then install packages properly via official repository?
This is what I have done and have done in the past.
Still a “apt-get update” would be better, especially for new users, or those not experienced with more complicated installations. Unless the aim of this is to make it so that the use of URBACKUP is limited to those that can spare the time to realise the documentation is wrong, to sift through the forums and extra download documentation, with with the experience to experiment until they actually work out how to install it. Most new users I expect wouldn’t bother…