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Every time I type sudo apt update this information appears: The box was unticked when I check the software and updates

elizabeth@elizabeth:~$ sudo apt-get update
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:2 http://gb.archive.ubuntu.com/ubuntu bionic InRelease                     
Get:3 http://gb.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   
Get:4 http://gb.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] 
Fetched 252 kB in 1s (175 kB/s)                              
Reading package lists... Done

Is there a fix?

1 Answers1

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Open software and updates and uncheck the option Installable from CD-ROM/DVD enter image description here