Muon is stuck on lubuntu cosmic. How do I get off this dead end?

Question

Muon is using cosmic. http://security.ubuntu.com/ubuntu/dists/ does list cosmic. I do not see any reference to cosmic in the GUI but, I get an error saying it cannot find the file in the cosmic directory. Where can I see where Muon says it wants cosmic? How do I change it?
$ apt-cache policy muon
muon:  
  Installed: 4:5.8.0-1ubuntu4
  Candidate: 4:5.8.0-1ubuntu4
  Version table:
  *** 4:5.8.0-1ubuntu4 100
        100 /var/lib/dpkg/status

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.10
Release:        18.10
Codename:       cosmic

/etc/apt/sources.list lists cosmic but where is this specified/shown with Muon?

Vojtech Trefny · Answer

As @muru pointed out, Ubuntu 18.10 EOL was more than a year ago and its repositories were removed from main mirrors and moved to old-releases.ubuntu.com. Ubuntu 18.10 codename is "Cosmic Curtlefish", that's where the "cosmic" comes from. Muon is basically complaining about cosmic repositories not being available.
You need to replace archive.ubuntu.com and us.archive.ubuntu.com in your /etc/apt/sources.list with http://old-releases.ubuntu.com/ubuntu.
And you should also upgrade to a supported version of Ubuntu soon.

Muon is stuck on lubuntu cosmic. How do I get off this dead end?

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