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I upgraded to Ubuntu 14.04 but it shows a red symbol on the top and gives error message in function update

E:unknown error:<type exceptions.type error> upgrade manager or any other file is not present
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  • Some questions for you that will help us in answering: From which Ubuntu version did you upgrade to 14.04? How did you upgrade (from the console or using the GUI)? Did you get any error messages while upgrading? Did you reboot after the upgrade? – ph0t0nix Aug 28 '14 at 8:56
  • from 12.04 i upgraded from console yes i got error while upgrading i infact got a blank screen yes i rebooted – user3798037 Aug 28 '14 at 9:03
  • What happens if you run do-release-upgrade? Does it tell you there is no new version, or does it continue the upgrade process? – ph0t0nix Aug 28 '14 at 9:05
  • it says no release found – user3798037 Aug 28 '14 at 9:17
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This can damage stuff. Do not run these commands unless you know what you're doing!

Hi Please try these options

sudo rm /var/lib/apt/lists/* -vf 

then

sudo apt-get update

or

sudo apt-get -f install
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  • This can damage stuff. Do not run these commands unless you know what you're doing! – Tim Nov 29 '14 at 14:55

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