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enter image description hereI ve had an issue with the update center about a month and a half ago and somehow resolved it.Today I checked my updates,clicked install and recieved an error message of "reguires installation of untrusted packages".The only thing I can think of that I ve done was installing playonlinux and wine.Anyone having or had this issue?

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Did you installed WINE by adding PPA. Or any other package through 3rd party PPA. – atenz Jul 11 '12 at 19:32
no I didnt.I installed playonlinux from software center and it installed wine – robert Jul 11 '12 at 19:34
run sudo apt-get update in terminal and post the output. – atenz Jul 11 '12 at 19:37
I ran -get update.everything went through fine it updated lol – robert Jul 12 '12 at 3:04
up vote 5 down vote accepted

Try running

sudo apt-get update && sudo apt-get upgrade

It will try and update the sources packages to check for available updates that can be updated in your system.

Untrusted packages errors mostly arise due to missing keys , if that is the case then note the missing keys combination of Numbers and Letters and do

sudo apt-key adv --recv-key --keyserver XXXXXXXXX

Where XXXXXXXXX is the key from the error you get.

Another reason would be the Mirrors not properly synced , running the Update command mostly solves them.

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Yes. I just had this issue myself. I checked my sources in /etc/apt/ and the only things I have that are non addresses are for Cinnamon and for the Opera browser. I finally did an 'apt-get upgrade --show-upgraded' in terminal (the old fashioned way!) and had no problem.

Just a little editorial comment - from the wacky new nameserver system to this little glitch, Ubuntu isn't really showing the quality it did in the past, FWIW.

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I found the solution to my problem here:

sudo apt-get update

gave me errors with BADSIG XXXXXX

The linked fix appears to replace the updaters keylist.

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Welcome to Ask Ubuntu. A link only answer is not considered to be appropriate. Websites close, links break. Please provide the essential steps for the solution by editing the answer and use the link as reference. See the FAQ. – user68186 Apr 23 '13 at 13:44

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