Could not initialize the package information

I got this error after trying to install video editing software:

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An unresolvable problem occurred while initializing the package information.

Please report this bug against the 'update-manager' package and include the following error message:

'E:Type 'wget' is not known on line 1 in source list /etc/apt/sources.list.d/winff.list, E:The list of sources could not be read.'

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Any ideas?

One of your Apt sources is wrong
it refers to winff (which is a GUI front end to ffmpeg)
most probably you are trying to install an incompatible Debian package on your Ubuntu system

can you post the output of

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cat /etc/apt.sources.list

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&

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cat /etc/apt/sources.list.d/winff.list

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WinFF is in the standard Ubuntu repos
there shouldn't be any reason to use a different source

The first one gave me:

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cat: /etc/apt.sources.list: No such file or directory

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The second command gave me:

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wget --quiet --output-document=- "http://winff.org/ubuntu/AAFE086A.gpg"

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I think YNot meant to write

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cat /etc/apt/sources.list

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But it looks like that /etc/apt/sources.list.d/winff.list file is wrong. Delete it. YNot says WinFF is in the Ubuntu repos so (assuming you are on Ubuntu) you shouldn't really need a different source anyway. However if there's a good reason you put that there you might want to try again with whatever instructions you used.

EDIT: Oh, I guess from the fact that you succeeded to install kdenlive that you fixed the problems you had here? If so disregard this lol.