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131 views

what causes this error by `apt-get update`

What causes this error when sudo apt-get update is issued? W: GPG error: http://download.virtualbox.org trusty InRelease: The following signatures couldn't be verified because the public key is not ...
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1answer
203 views

Error while upgrading to Ubuntu 13.04

When I tried to upgrade my Ubuntu 12.10: The operation failed E:GPG error: http://az-1.hpcloud.mirror.websitedevops.com quantal Release: The following signatures were invalid: NODATA 1 ...
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1answer
80 views

Adding new PPA is causing GPG error after apt-get update

Recently I had a lot of GPG errors with the following message W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn't be verified because the public key is not ...
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1answer
55 views

update cannot be done by update manager

I am a new Ubuntu user.12.04(32 bit ) version.I not update Ubuntu for 1 month. Now when I want to update using terminal sudo apt-get update then shows that: reading package list done..... :GPG error: ...
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1answer
47 views

The package information displayed by Ubuntu Software-Center is 17 days back and counting

While re-opening my Ubuntu 12.04 machine after a 2 weeks vacations, and successfully using the Update Manager to update my applications I see that The package information was last updated 17 days ...

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