When I try to update always apperas this message, but I try to remove on Sotware && Updates but always reapers, I have installed Ubuntu 23.04
sudo apt update
Get:1 file:/cdrom lunar InRelease
Ign:1 file:/cdrom lunar InRelease
Get:2 file:/cdrom lunar Release
Err:2 file:/cdrom lunar Release
File not found - /cdrom/dists/lunar/Release (2: No such file or directory)
Hit:3 http://archive.ubuntu.com/ubuntu lunar InRelease
Hit:4 http://archive.ubuntu.com/ubuntu lunar-proposed InRelease
Reading package lists... Done
E: The repository 'file:/cdrom lunar Release' no longer has 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.
W: http://archive.ubuntu.com/ubuntu/dists/lunar/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
W: http://archive.ubuntu.com/ubuntu/dis...sed/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.