repos on Debian 8

Media change: please insert the disc labeled
'Debian GNU/Linux 8.11.0 _Jessie_ - Official amd64 DVD Binary-1 20180623-13:07'
in the drive '/media/cdrom/' and press enter

Solution

https://askubuntu.com/questions/124017/how-do-i-restore-the-default-repositories

vi /etc/apt/sources.list Comment out the CDROM line

Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)

https://debgen.simplylinux.ch/

Error

W: GPG error: http://packages.dotdeb.org jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E9C74FEEA2098A6E
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-updates/InRelease Unable to find expected entry 'main/source/Sources' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.

su
gpg --keyserver keys.gnupg.net --recv-key 89DF5277 && gpg -a --export 89DF5277 | apt-key add -