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I'm tyring to do this

$ sudo yum install gnome-tweak-tool

And I get this instant response:

Loaded plugins: langpacks, presto, refresh-packagekit
http://yum.postgresql.org/9.1/redhat/rhel-18-x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://yum.postgresql.org/9.1/redhat/rhel-18-x86_64/repodata/repomd.xml
Trying other mirror.
Error: failure: repodata/repomd.xml from pgdg91: [Errno 256] No more mirrors to try.
http://yum.postgresql.org/9.1/redhat/rhel-18-x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://yum.postgresql.org/9.1/redhat/rhel-18-x86_64/repodata/repomd.xml

I think I messed up the yum repo, is there a way to fix this?

share|improve this question
    
First Find Which .repo file is giving problem. For that first change directory to /etc/yum.repos.d/ after that in the terminal write this command grep -r "yum.postgresql.org" . and press Enter. please Post the output in your next comment. –  max Jun 13 '13 at 9:18
    
OR try this command yum clean all –  max Jun 13 '13 at 9:22

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