Having a bit of an issue with Mint Update; it will work for most repositories (in fact all except this one particular one) - but when hitting update (or sudo apt-get update returns the same results) i get:
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W: Failed to fetch http://packages.linuxmint.com/dists/isadora/Release Unable to find expected entry universe/binary-i386/Packages in Meta-index file (malformed Release file?) E: Some index files failed to download, they have been ignored, or old ones used instead.
For those people who have stumbled across this thread from searching; this appears to be an issue associated with the installation of certain packages adding the "universe" or "multiverse" segment to the sources.list file for apt.
Basically, Linux Mint doesn't have an Isadora 'universe' (or 'multiverse') repo, and needs to be removed as a result.
To fix; edit your '/etc/apt/sources.list' file (you'll need sudo access else it'll be read only) to remove the universe/multiverse entry for any linuxmint/Isadora entries (LEAVE the ones for Ubuntu repos!).
If you're running LinuxMint KDE, or otherwise can't find any mention of LinuxMint and Universe/Multiverse in your sources.list file, then check "/etc/apt/sources.list.d/mintkde.list" and "/etc/apt/sources.list.d/mint.list" - they might be attached to a mirror instead (See posts on Page 2)
There is also a BUG REPORT filed - please add your findings to this report to help resolve the cause of this issue:
Hope this helps!!