I have been getting following error while running
sudo apt-get update
W: GPG error: https://download.01.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A902DDA375E52366
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_i18n_Translation-en
E: The package lists or status file could not be parsed or opened.
What should I do to fix this problem?
Also sometimes I get a red icon in the Task Bar pane.