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I installed Ubuntu 12.04LTS operating system but when I added a new repository with the packages I find this error:

Unable to resolve the package dependencies

Information requested by @electron:

sudo dpkg --configure -a

sudo apt-get install -f
Reading package lists ... Done
Building dependency tree
Reading state information ... Done
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

sudo apt-get update
E: The download of some index files failed, they have been ignored, or old ones were used instead.
Martin Thornton
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  • try to use the following commands and check if they solve your problem 1) sudo dpkg --configure -a 2) sudo apt-get install -f 3)sudo apt-get update – Prateek Joshi Aug 20 '15 at 23:20
  • in "software & updates" change Ubuntu software from Main Server and Reload .Now try.Similar question [here](http://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa) – Ravan Aug 21 '15 at 02:26

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