Places to check:
/etc/apt/apt.conf.d/10periodic
Look for "APT::Default-Release" line.

Check your /etc/apt/sources.list file. Does that term appear there?

After an update, my sources.list was mass-changed from "oneiric" to
"precise". But I haven't upgraded the system to precise yet. (At least,
the system doesn't think so.)

In sources.list, I copied the top two lines that read:

deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted

and edited them to say:

deb http://us.archive.ubuntu.com/ubuntu/ oneiric main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ oneiric main restricted

Then, update-manager offered a "Partial upgrade". Not quite working, but
appears to be progress.

I suppose one could also try changing the APT::Default-Release from
"oneiric" to "precise", too.

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https://bugs.launchpad.net/bugs/978821

Title:
  E: Значение «oneiric» недопустимо для APT::Default-Release, так как
  выпуск недоступен в источниках E: _cache->open() failed, please
  report.

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