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
(/var/lib/apt/lists/www.duinsoft.nl_pkg_dists_debs_all_binary-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?

You may want to run apt-get update to correct these problemsbutapt-get updatedoes not fix the problem – Someone Like You Mar 25 '12 at 19:33