After it downloaded the file, it reports an authentication failure and skips to the next task.

After finishing all downloads it reports that I should check my internet connection.

Just to make sure, I ran update-manager from terminal but still the same problem persisted.

Result of apt-get upgrade:

E: Failed to fetch http://ubuntu.01link.hk/pool/main/a/app-install-data-ubuntu/app-install-data_14.04.1_all.deb  Hash Sum mismatch

E: Failed to fetch http://ubuntu.01link.hk/pool/main/s/software-center/software-center_13.10-0ubuntu4.1_all.deb  Hash Sum mismatch
  • you may have slow internet connection? – kamil Jul 11 '14 at 15:16
  • Everything else downloaded perfectly the only problem is with app-install-data and software-center. Also, it goes up till 100% then it shows the error. – Saurabh Jul 11 '14 at 15:28
  • 1
    Can you open a terminal and type sudo apt-get update && sudo apt-get upgrade, and post the results? – Mitch Jul 11 '14 at 15:31
  • which os version u r using ? – A J Jul 12 '14 at 9:20
  • ubuntu 14.04 LTS – Saurabh Jul 12 '14 at 9:41

I finally got it to work. Tumbleweed's post here pointed me to what went wrong. I changed the mirror to Main Server and it all worked fine!

Anwar Shah's post

I suppose even this can be done, but changing the mirror is a better and more permanent solution.

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