Problem with installing software after usbstick install

I installed Ubuntu mate from a stick. Now when I want to update something UbuntuMate complains. It keeps asking for a cdrom that doesn’t exist. I wont go to the stick it was installed from.
Can anyone help.
Tito Bill

Go to "system/software and updates" and choose the "other software" tab and make sure "cd rom" is not selected.

Then close the software and updates and run the following commands in a terminal:

sudo apt-get update

sudo apt-get upgrade

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