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All other answers I find only end up pointing to instructions:

So interpreting that site, added line:

deb oneiric universe

to /etc/apt/sources.list and ran apt-get update.

(From experimentation I had to add the "universe" or "main" at the end to avoid parse error in the repositories list, preventing apt or synaptic from updating at all).

However the problem persists:

W: Failed to fetch‌​ges 404 Not Found 

I enter that URL in a browser and clearly see that path is not there. However this is: (under which the Packages file actually lies, etc.)

Tried other mirrors, same problem.

lsb_release -a

Ubuntu 11.10

The version of R available initially prevents me from installing updated packages, eg.:

> install.packages("PerformanceAnalytics")
Installing package(s) into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
Warning message:
In getDependencies(pkgs, dependencies, available, lib) :
  package ‘PerformanceAnalytics’ is not available (for R version 2.13.1)

Where I am going wrong?

share|improve this question
up vote 1 down vote accepted

change the line in /etc/apt/sources.list to

   deb oneiric/

and retry

 apt-get update
share|improve this answer
Thanks. That pushed it forward to: dpkg: warning: files list file for package python-twisted-core' missing, assuming package has no files currently installed. (Reading database ... 246955 files and directories currently installed.) Preparing to replace python-twisted-core 11.0.0-2 (using .../python-twisted-core_11.0.0-2_all.deb) ... Unpacking replacement python-twisted-core ... dpkg: ../../src/archives.c:985: tarobject: Assertion r == stab.st_size' failed. – Marcos Jun 19 '12 at 12:43

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