I am using Ubuntu 16.04.3 LTS. While installing Firefox, this error is shown:

The following NEW packages will be installed:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  firefox
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 44.5 MB of archives.
After this operation, 176 MB of additional disk space will be used.
Get:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 firefox amd64 58.0.2+build1-0ubuntu0.16.04.1 [44.5 MB]
Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 firefox amd64 58.0.2+build1-0ubuntu0.16.04.1                                  
  Hash Sum mismatch
Get:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 firefox amd64 58.0.2+build1-0ubuntu0.16.04.1 [44.5 MB]                        
Err:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 firefox amd64 58.0.2+build1-0ubuntu0.16.04.1                                  
  Hash Sum mismatch
Fetched 88.9 MB in 2min 23s (621 kB/s)                                                                                                         
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_58.0.2+build1-0ubuntu0.16.04.1_amd64.deb  Hash Sum mismatch

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

How can I fix "Hash Sum mismatch"?

Try removing all the content of /var/lib/apt/lists directory, you can use this command:

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

Then execute this command:

sudo apt update

And finally, try to install firefox again:

sudo apt install firefox

If this doesn't work, you can try:

Settings → Software & Updates → Ubuntu Software: Download from: Change Local to Main Server, or any other Server that is close to you.

Hope it helps.

  • Sorry. But it didn't work. I have tried it before... – linix Mar 8 at 14:29
  • Try this: Settings → Software & Updates → Ubuntu Software: Download from: Change Local to Main Server. – galoget Mar 8 at 14:33
  • I isn't working.. Same as before... – linix Mar 8 at 15:06
  • I found this link where you cand see various solutions, try them and let me know if it works. – galoget Mar 8 at 15:13
  • Finally worked for this download server: Russian Federation->mirror.logol.ru – linix Mar 9 at 7:35

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