[Bug 897869] [NEW] proxy on APT Something wicked happened resolving 'slc-isa:8080' (-5 - No address associated with hostname)

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Hello i   use some proxy setting in firefox and network proxy setting from administrator menu, 
then i change my location and i use internet with out proxy, any why after i removie the proxy setting the APT is give me this  error 

W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/maverick-
security/multiverse/binary-i386/Packages.gz  Something wicked happened
resolving 'slc-isa:8080' (-5 - No address associated with hostname)

when i try to do this 
 apt-get install openjdk-6-jdk

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: synaptic 0.63.1ubuntu14
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Tue Nov 29 23:56:45 2011
ExecutablePath: /usr/sbin/synaptic
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: synaptic

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: apport-bug i386 maverick
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proxy on APT Something wicked happened resolving 'slc-isa:8080' (-5 - No address associated with hostname)
https://bugs.launchpad.net/bugs/897869
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