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Today I am trying to update my os. Now i am using ubuntu 15.10 and when i was trying to update, it shows this error:

Failed to fetch 
http://bd.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_50.0.2+build1-0ubuntu0.16.04.1_amd64.deb 
Hash Sum mismatch 
Failed to fetch 
http://bd.archive.ubuntu.com/ubuntu/pool/main/f/fonts-noto-cjk/fonts-noto-cjk_1.004+repack2-1~ubuntu1_all.deb 
Hash Sum mismatch


rr Upgrade tool signature                                                     
  Temporary failure resolving 'bd.archive.ubuntu.com'                          
Get:1 Upgrade tool [1,266 kB]                                                  
Fetched 1,266 kB in 6s (55.7 kB/s)                                             
WARNING:root:file 'xenial.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem.

Can anyone help about this ??

d a i s y
  • 5,551
abdul khalak
  • 1

1 Answers1

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Just type in the following commands to fix the errors 

sudo apt-get clean
sudo apt-get update

Then run the actual system update

sudo apt-get update && sudo apt-get dist-upgrade
itssme
  • 194