Article 6GMAT (Bullseye) type ��deb� is not known on line 1 in source list /etc/apt/sources.list.d/backports.list

(Bullseye) type ��deb� is not known on line 1 in source list /etc/apt/sources.list.d/backports.list

by
RealNikkiB
from LinuxQuestions.org on (#6GMAT)
Hi, all. Iim new to the forums and a little bit tech illiterate so please be kind. I have Bullseye and I was trying to update so I can install Firefox, but Iim getting:

E: Type iidebi is not known on line 1 in source list /etc/apt/sources.list.d/backports.list
E: The list of sources could not be read

I know that means thereis a mistake in line 1 of the backports file in sources.list.d but how do I fix it?? Obviously Iive Googled but all Iim finding is how to edit the source list and how to add sources.list.d files, and I wasnit about to start editing files or anything in my source list and just cross my fingers and hope it works. Iim sure itis something stupid like that i shouldnit be there but Iid really like some advice from someone who knows what theyire doing before I mess with anything. Thanks in advance.
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