After installing Ubuntu 12.04 I was trying to install Kile as to write .tex file . But this message showing after attempting 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 software. What can I do now?