I can't install any new software, i keep getting this message [duplicate]
Solution 1:
You should:
- open Software & Updates (or
software-properties-gtkfrom terminal) -
then in the area named Installable from CD-ROM/DVD uncheck the Cdrom with Ubuntu 18.04 (Bionic Beaver).
-
make sure that you do not have checked Cdrom with Ubuntu 18.04 'Bionic Beaver' on Other Software tab:
-
to keep your system secure on Updates tab enable security updates (bionic-security, bionic-updates, bionic-backports):
