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In an effort to use my printer, I installed a PPA but in the end, this PPA was not necessary. Now, this PPA causes an error when updates are loaded. The update error message is the following:

W:Failed to fetch  404  Not Found
, W:Failed to fetch  404  Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.

I looked over the web how to remove a ppa but the answers are too technical for my level of understanding. I found this line:

sudo add-apt-repository --remove ppa:whatever/ppa

but I don't know what should be put in place of the "whatever". On top of that, I can't even remember how I installed this PPA. I know I went to this page:

and somehow, followed the included instructions, without really knowing what I was doing.

According to some help pages I found, installed file in /etc/apt/sources.list.d should give me some hints:

  jockey.list                            nvbn-rm-ppa-precise.list
langdalepl-gvfs-mtp-precise.list  precise-partner.list

but I don't understand what to look for in this list of files. I suspect that the culprits is michael-gruz-canon-precise.list, but that doesn't help me much.

I hope I put all the necessary info here.

Thank you for your help

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up vote 4 down vote accepted

Run in terminal:

sudo apt-add-repository --remove ppa:michael-gruz/canon

sudo apt-get update && sudo apt-get upgrade

sudo apt-get autoremove

See also:

share|improve this answer

You should try to fix your problem with YPPA. Here, this will help you. Use y ppa to remove any duplicate ppa or fix ppa errors after installing it.

    sudo add-apt-repository ppa:webupd8team/y-ppa-manager
    sudo apt-get update
    sudo apt-get install y-ppa-manager
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