سلام دوستان، من از زوبونتو ۱۸٫۰۴ استفاده میکنم. هنگامی که از دستور sudo apt update استفاده میکنم خروجی زیر را میگیریم.
Ign:1 cdrom://Xubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426) bionic InRelease
Err:2 cdrom://Xubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426) bionic Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://ubuntu.parspack.com/ubuntu bionic InRelease
Hit:4 http://ubuntu.parspack.com/ubuntu bionic-updates InRelease
Hit:5 http://ubuntu.parspack.com/ubuntu bionic-backports InRelease
Ign:6 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 InRelease
Hit:7 http://ubuntu.parspack.com/ubuntu bionic-security InRelease
Hit:8 http://ppa.launchpad.net/numix/ppa/ubuntu bionic InRelease
Get:9 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release [1,007 B]
Get:10 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release.gpg [481 B]
Ign:10 http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release.gpg
Hit:11 http://archive.canonical.com/ubuntu bionic InRelease
Reading package lists... Done
E: The repository 'cdrom://Xubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426) bionic 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.
W: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A7D1D38BEB6D886
E: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release' is not signed.
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.
ممنون میشم راهنمایی کنید.