muon and riot repository

[Ivan Panin]

Good day!

I have a question regarding muon. I am new to linux and would like to 
understand this issue. I added Riot messenger's repository to lubuntu 20.04 
according to riot's web page:
https://riot.im/download/desktop/

sudo apt install -y wget apt-transport-https
sudo wget -O /usr/share/keyrings/riot-im-archive-keyring.gpg 
https://packages.riot.im/debian/riot-im-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/riot-im-archive-keyring.gpg] 
https://packages.riot.im/debian/ default main" |
    sudo tee /etc/apt/sources.list.d/riot-im.list
sudo apt update
sudo apt install riot-desktop

Riot and repository has been installed, but I can see some strange 
behaviour of package manager (see attached picture). There is no name for 
this repository (on the left). Also If I will put "riot" to the search 
field, these two riot packages would disappear (filtered out) from the 
list. I can see this repository in command line when sudo apt update. And I 
can't see it in Software Sources and Discover

My question is - what additional information should be added and to what 
files, so this repository to be shown reliably across the system (in 
Software Sources, Muon, Discover and in command line) ?

Thanks.

Kind regards,
-- 
Ivan Panin
ivanpanin at mailbox.org
+7(921)3453456
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