could not download all repository indexes

Asked by gibz

when i run the update manager i get this error set

Failed to fetch http://ppa.launchpad.net/secenmachines/flash/ubuntu/dists/karmic/main/binary-i386/Packages.gz 404 Not Found
Failed to fetch http://ppa.launchpad.net/user/ppa-name/ubuntu/dists/karmic/main/binary-i386/Packages.gz 404 Not Found
Failed to fetch http://downloads.sourceforge.net/project/ubuntuuzilla/mozilla/apt/dists/all/main/binary-i386/Packages.gz 404 Not Found
Some index files failed to download, they have been ignored, or old ones used instead.

how do i fix this.

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actionparsnip (andrew-woodhead666) said :
#1

http://ppa.launchpad.net/secenmachines/ no longer exists or is down for maintenance

neither does http://ppa.launchpad.net/user/

Ubuntuzilla appears to be a mozilla installer which is pointless as:
a) Its on the repo and
b) if you want the devel versions there is a mozilla PPA

Yuou can add this with:

sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa; sudo apt-get update

If you now search in the software centre you will find lots more versions of firefox / thunderbird to try.

I suggest you remove these ppas using system -> administration -> software souurces

or disable them to try connecting later,

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