After installing Ubuntu 12.04 I was trying to install Kile in order to edit
.tex files. But this message showed up on attempting to install Kile and Updates:
W:Failed to fetch gzip:/var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_precise-security_restricted_binary-i386_Packages Hash Sum mismatch , E:Some index files failed to download. They have been ignored, or old ones used instead
Now I can't install any software at all. What can I do?
I have done which you said . But now I'm trying to install Okular but this is showing :-(