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I'm on linux mint 12, when i run sudo apt-get update i see:

W: Duplicate sources.list entry http://www.duinsoft.nl/pkg/ debs/all i386 Packages
W: You may want to run apt-get update to correct these problems

FSlint does not find any duplicates in /var/lib/apt/lists. When i search /var/lib/apt/lists manually, i see 3 files:

www.duinsoft.nl_pkg_dists_debs_all_binary-i386_Packages size: 3.3 kb www.duinsoft.nl_pkg_dists_debs_release size: 2.9 kb www.duinsoft.nl_pkg_dists_debs_release.gpg size: 490 bytes

This has something to do with java installation. Anyway should i delete any of these files?

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it says You may want to run apt-get update to correct these problems but apt-get update does not fix the problem – Lynob Mar 25 '12 at 19:33
up vote 3 down vote accepted

You don't have duplicate packages.

As it says you have a duplicate in your sources list. How you fix this can depend on the Package Manager(s) that you use. To go straight to the sources list, open a Terminal and issue the command:

gksudo gedit /etc/apt/sources.list

Look for the duplicate. You can disable one by putting a # at the beginning of the line or removing duplicate lines.

http://www.duinsoft.nl/pkg/ debs/all

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Edit your /etc/apt/sources.list and remove the duplicated lines.

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Look at /etc/apt/sources.list AND /etc/apt/sources.list.d - the later being used by e.g. automated added PPAs.

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