ok i just solved the problem no more need to search...found it in some
other launchpad bugs report...
just take care of the whole directory:
sudo rm /var/lib/apt/lists/* -vf
then try updating: sudo apt-get update
then try to use the update-manager
just restart your ubuntu and thats all;upgrade done.
** Changed in: update-manager (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/874425
Title:
Bug when upgrading
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