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When I am installing firefox using apt-get command it throwing this error: 

Failed to fetch http://ppa.launchpad.net/mozillateam/firefox-next/ubuntu/pool/main/f/firefox/firefox_27.0~b2+build1-0ubuntu0.12.04.1_amd64.deb  Size mismatch

Is there anyone who can help. Thanks in advance.

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  • Are you using ubuntu? Firefox is installed when you install ubuntu.
    – jobin
    Jan 10, 2014 at 7:43
  • yes I am using ubuntu12.04LTS Want to reinstall it.
    – user234049
    Jan 10, 2014 at 7:44
  • Why would you want to reinstall it? Do you have internet?
    – Lucio
    Jan 10, 2014 at 7:45
  • Because I removed it by mistake. Now want to install it again but it is throwing error. Yes I have internet connection.
    – user234049
    Jan 10, 2014 at 7:46
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    You are downloading a beta version of firefox from the ppa. Do you want to install the stable release instead?
    – jobin
    Jan 10, 2014 at 7:48

2 Answers 2

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To remove the ppa for firefox you will first need to install ppa-purge. To install ppa-purge:

sudo apt-get install ppa-purge

Then remove the ppa using:

sudo ppa-purge ppa:mozillateam/firefox-next

This should display a message which says it is removing the ppa from the system and at the end:

PPA purged successfully

Then install the stable release of firefox using:

sudo apt-get install firefox
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  • @user234049: Please accept the answer if it has worked for you.
    – jobin
    Jan 11, 2014 at 5:41
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Open Software & Updates either by typing the same in dash or by keying in ALT + F2 shortcut and then running the command software-properties-gtk. Then goto the second tab Other Software from there you can manually remove the wrong ppa (personal package archive). Then you can again try to install Mozilla Firefox either through Ubuntu Software Center or through terminal with the following command: 

sudo apt-get install firefox

have a nice day

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