unable to do updates of triskel 10

Ign:1 http: etiona-security InRelease

Err:2 http: etiona-security Release

Undetermined Error

Hit:3 https://dl.google.com/linux/chrome/deb stable InRelease

Hit:4 http://ppa.launchpad.net/flatpak/stable/ubuntu focal InRelease

Hit:5 https://archive.trisquel.org/trisquel nabia InRelease

Hit:6 http://us.archive.trisquel.info/trisquel etiona InRelease

Hit:7 http://us.archive.trisquel.info/trisquel etiona-updates InRelease

Hit:8 http://us.archive.trisquel.info/trisquel nabia InRelease

Hit:9 http://us.archive.trisquel.info/trisquel nabia-updates InRelease

Hit:10 http://us.archive.trisquel.info/trisquel nabia-security
InRelease

Hit:11 http://us.archive.trisquel.info/trisquel etiona-backports
InRelease

Reading package lists... Done

E: The repository 'http: etiona-security 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.

N: Usage of apt_auth.conf(5) should be preferred over embedding login
information directly in the sources.list(5) entry for 'http:'

What will be the further commands in this case ?
Kindly guide me.