Not sure if the issue you describe is caused by those entries, but here is how to revert them:
Open a terminal and type the following command:
pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY gedit /etc/fstab
(best copy the command and paste it into the command line by pressing CTRL+SHIFT+V). You will be asked for your password.
This will open the file /etc/fstab
in a text editor.
Be very careful in the editor, you are running it as root
At the end of the file you will find the following lines
#cdrom 0
/dev/sr0 /media/cdrom/ auto ro,noauto,user,exec 0 0
#cdrom 1
/dev/sr0 /media/cdrom/ auto ro,noauto,user,exec 0 0
insert a #
at the beginning of the two lines starting with /dev/sr0
, the save the file.
Explanation of the command line
pkexec
invokes the commadnd gedit /etc/fstab
with root permissions (like sudo
would do, but for a GUI-program)
env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY
send the current values for DISPLAY
(usually :0
) and XAUTHORITY
into the respective Environment variables for pkexec
, thus preventing a permission problem because the display to use does not belong to root
You should not use sudo
to invoke a GUI-program, that might cause the inability to log into your Desktop.