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[EP-tech] Problem updaing Ubuntu server


We host eprints on an Ubuntu server (Release 12.04 (Precise) 32-bit.  Kernel Linux 3.2.0-33-generic-pae.  GNOME 3.4.1.)

Update Manager informs me that 80 updates are ready for installation.  But a warning also pops up saying:

"Not all updates can be installed.  Run a partial upgrade, to install as many updates as possible.
"This can be caused by:
"A previous upgrade which did not complete
"Problems with some of the installed software
"Unoffical software packages not provided by Ubuntu
"Normal changes of a pre-release version of Ubuntu"

The warning pop up gives the option of a "Partial upgrade".  But if I choose this option eventually the system presents me with the message:

"Error authenticating some packages:
"It was not possible to authenticate some packages.  This may be a transient network problem.  You may want to "try again later.  See below for a list of unauthenticated packages."

I got the same messages last Friday.

I have not encountered this problem before when applying updates.  Any suggestion as to how I may resolve this problem would be very welcome.

Thank you.

Alexander J Birchall, Library Systems Manager, The Sheppard Library, Middlesex University, London NW4 4BT

Tel +44 (0) 208 411 5235
Mobile:  07765 237 570


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