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the following error is preventing me from installing anything on Xubuntu 11.10. How can I fix it??

$ sudo apt-get install meld
Reading package lists... Done
Building dependency tree       
Reading state information... Done
meld is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? Y
Setting up flashplugin-downloader ( ...
--2012-02-06 21:23:36--
Connecting to||:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2012-02-06 21:23:36 ERROR 404: Not Found.

download failed
The Flash plugin is NOT installed.
dpkg: error processing flashplugin-downloader (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)
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Try sudo apt-get install -f then sudo dpkg --configure -a. – Uri Herrera Feb 6 '12 at 21:32
up vote 3 down vote accepted

flashplugin-downloader is a package from the multiverse repositories. Version is from 7 October 2011 and has been superseded by version, released on 11 November 2011 (source).

Some possible causes:

Instead of using the flashplugin-downloader package, I suggest you to install Flash as described on How do I install Adobe Flash player?

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