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I get this error when I run the above command.

W: GPG error: http://packages.ros.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5523BAEEB01FA116
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/Release  Unable to find expected entry 'main/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.

I tried the methods posted in the forums but the problem isn't solved. The details about my laptop are as follows:

kv@kv:~$ uname -a
Linux kv 3.19.0-49-generic #55~14.04.1-Ubuntu SMP Fri Jan 22 11:24:31 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
  • Me too. Have been searching on this all day. As soon as updater gets to the "Requires installation of untrusted packages" (why? Might be related to this in my case), Updater closes down with no updates having been made. I've been investigating a fix, but no joy yet. – Dɑvïd Mar 22 '16 at 15:14
  • Please find the solution here: https://askubuntu.com/questions/127326/how-to-fix-missing-gpg-keys/136735#136735 – monitor35 Mar 22 '16 at 15:26
  • And for the line about google chrome, look at this question: http://askubuntu.com/questions/724093/no-more-updates-for-google-chrome-apt-get-update-error – Byte Commander Mar 22 '16 at 15:30
  • @monitor35 I applied that "fix" earlier today - did nothing. – Dɑvïd Mar 22 '16 at 15:33
  • @ByteCommander - Thanks! Using this answer fixed it. I already had y-ppa-manager on my system, so very fast solution. – Dɑvïd Mar 22 '16 at 15:37
  • @monitor35 - I got the same error message –  Mar 22 '16 at 16:05
  • This worked for me for fixing the NO_PUBKEY error http://opensourceforgeeks.blogspot.in/2013/04/w-gpg-error-httpppalaunchpadnet-precise.html –  Mar 22 '16 at 16:47

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