Firefox nightly 10.0 and Firefox 7.0 both present why ?

Firefox nightly is the version corresponding to some future release of Firefox. It might crash. It probably won't chew up your file system, but Mozilla will not promise that.

Just the fact that you are asking indicates the answer. Remove the nightly and keep Firefox 7.

Thanks Jacobsallan, that solved my question.

I cannot remove the nightly version. I have used the command "sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa" . Please give me suggession how to remove completely.

If you used that command, then you should *not* also have an earlier version of Firefox--that command will upgrade the earlier version to the later version. The exception is if your earlier version is not installed in the usual way. Do you know if that is the case?

In any case, *if* you installed the nightly build using the PPA, then you *should* be able to remove that PPA and downgrade Firefox to whatever version is provided by your other software sources by using:

sudo apt-get update
sudo apt-get install ppa-purge
sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa

What happens when you run those commands? (Please select all the text in the Terminal -- Edit > Select All -- copy it to the clipboard -- Edit > Copy -- and paste it here.)

How did you install the nightly version?

Sorry, the first paragraph of my previous post should have said:

If you used the mozilla-daily PPA, then you should *not* also have an earlier version of Firefox--installing Firefox from that PPA will upgrade the earlier version to the later version. The exception is if your earlier version is not installed in the usual way. Do you know if that is the case?

Sir you are right .I have installed firefox 7 from ppa ,I didnt remember the command exactly. I have installed nightly using the command from
http://www.upubuntu.com/2011/07/how-to-install-next-firefox-versions.html.

My problem is that both the version are present. I want to remove anyone . which one should I remove and please help me . How to remove . the command I used and the output is follows

sukhendu@sukhendu:~$ sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa
[sudo] password for sukhendu:
sudo: ppa-purge: command not found
sukhendu@sukhendu:~$

thanks

If you're not sure which you want to use, you should use Firefox 7 from the firefox-stable PPA. To remove the nightly build and downgrade to the highest version provided by any other enabled software source (which should be Firefox 7.0.1, but we'll check), run these commands, as previously provided:

sudo apt-get update
sudo apt-get install ppa-purge
sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa

You only ran the third of these commands, so it did not work. (In the future, after running those commands successfully, you can remove PPA's without the middle command, but you should still use the first command and, modified for whatever other PPA you are removing, the third command.)

If those commands do not appear to succeed, then please select all the text from the Terminal, copy it to the clipboard, and paste it here. If they do appear to succeed, then you can just provide the output of:

which -a firefox; echo; firefox -v; echo; apt-cache policy firefox

That should reveal what the currently installed version of Firefox is and if there are any likely problems with the way it is set up.

Sir the output is

sukhendu@sukhendu:~$ sudo apt-get update
Hit http://security.ubuntu.com maverick-security Release.gpg
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/main Translation-en_US
Hit http://us.archive.ubuntu.com maverick Release.gpg
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Get:1 http://dl.google.com stable Release.gpg [198B]
Hit http://extras.ubuntu.com maverick Release.gpg
Ign http://extras.ubuntu.com/ubuntu/ maverick/main Translation-en
Ign http://extras.ubuntu.com/ubuntu/ maverick/main Translation-en_US
Hit http://packages.medibuntu.org maverick Release.gpg
Ign http://ppa.launchpad.net maverick Release.gpg
Ign http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/ maverick/main Translation-en
Ign http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/ maverick/main Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick-updates Release.gpg
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/multiverse Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/restricted Translation-en_US
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en
Ign http://security.ubuntu.com/ubuntu/ maverick-security/universe Translation-en_US
Hit http://security.ubuntu.com maverick-security Release
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main Translation-en_US
Hit http://extras.ubuntu.com maverick Release
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en
Hit http://ppa.launchpad.net maverick Release.gpg
Ign http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu/ maverick/main Translation-en
Ign http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu/ maverick/main Translation-en_US
Hit http://ppa.launchpad.net maverick Release.gpg
Ign http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu/ maverick/main Translation-en
Ign http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu/ maverick/main Translation-en_US
Ign http://ppa.launchpad.net maverick Release
Ign http://dl.google.com/linux/talkplugin/deb/ stable/main Translation-en
Hit http://security.ubuntu.com maverick-security/main Sources
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/multiverse Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/restricted Translation-en_US
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en
Ign http://us.archive.ubuntu.com/ubuntu/ maverick-updates/universe Translation-en_US
Hit http://us.archive.ubuntu.com maverick Release
Ign http://packages.medibuntu.org/ maverick/free Translation-en
Hit http://extras.ubuntu.com maverick/main Sources
Ign http://dl.google.com/linux/talkplugin/deb/ stable/main Translation-en_US
Hit http://ppa.launchpad.net maverick Release
Hit http://ppa.launchpad.net maverick Release
Get:2 http://dl.google.com stable Release [1,347B]
Hit http://security.ubuntu.com maverick-security/restricted Sources
Hit http://security.ubuntu.com maverick-security/universe Sources
Hit http://security.ubuntu.com maverick-security/multiverse Sources
Hit http://security.ubuntu.com maverick-security/main i386 Packages
Hit http://security.ubuntu.com maverick-security/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates Release
Hit http://security.ubuntu.com maverick-security/universe i386 Packages
Hit http://security.ubuntu.com maverick-security/multiverse i386 Packages
Hit http://extras.ubuntu.com maverick/main i386 Packages
Ign http://ppa.launchpad.net maverick/main Sources
Hit http://us.archive.ubuntu.com maverick/main Sources
Ign http://ppa.launchpad.net maverick/main i386 Packages
Hit http://us.archive.ubuntu.com maverick/restricted Sources
Hit http://us.archive.ubuntu.com maverick/universe Sources
Hit http://us.archive.ubuntu.com maverick/multiverse Sources
Hit http://us.archive.ubuntu.com maverick/main i386 Packages
Hit http://us.archive.ubuntu.com maverick/restricted i386 Packages
Ign http://packages.medibuntu.org/ maverick/free Translation-en_US
Hit http://us.archive.ubuntu.com maverick/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick/multiverse i386 Packages
Hit http://ppa.launchpad.net maverick/main Sources
Hit http://ppa.launchpad.net maverick/main i386 Packages
Get:3 http://dl.google.com stable/main i386 Packages [779B]
Hit http://us.archive.ubuntu.com maverick-updates/main Sources
Hit http://us.archive.ubuntu.com maverick-updates/restricted Sources
Hit http://us.archive.ubuntu.com maverick-updates/universe Sources
Hit http://us.archive.ubuntu.com maverick-updates/multiverse Sources
Hit http://us.archive.ubuntu.com maverick-updates/main i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com maverick-updates/multiverse i386 Packages
Hit http://ppa.launchpad.net maverick/main Sources
Hit http://ppa.launchpad.net maverick/main i386 Packages
Err http://ppa.launchpad.net maverick/main Sources
  404 Not Found
Ign http://packages.medibuntu.org/ maverick/non-free Translation-en
Err http://ppa.launchpad.net maverick/main i386 Packages
  404 Not Found
Ign http://packages.medibuntu.org/ maverick/non-free Translation-en_US
Hit http://packages.medibuntu.org maverick Release
Hit http://packages.medibuntu.org maverick/free i386 Packages
Hit http://packages.medibuntu.org maverick/non-free i386 Packages
Fetched 2,324B in 19s (117B/s)
W: Failed to fetch http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/dists/maverick/main/binary-i386/Packages.gz 404 Not Found

E: Some index files failed to download, they have been ignored, or old ones used instead.
sukhendu@sukhendu:~$ sudo apt-get install ppa-purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  krita-data kdelibs4c2a kword-data freetds-common clamav libart-2.0-2 libglew1.5 clamav-freshclam libopenshiva0.7 kdelibs-data kthesaurus libplot2c2 libgtlcore0.7 krita libpqxx-3.0
  liblualib50 kformula clamav-base create-resources koffice-data libclamav6 dcraw ruby1.8 pstoedit ruby libavahi-qt3-1 libgsf-1-common libmagick++3 libopenctl0.7 libsybdb5 kchart karbon
  libqtshiva0.1 libtommath0 libxbase2.0-0 firefox-branding libqt3-mt kplato liblua50 libruby1.8 libgsl0ldbl koffice-libs librcps0 libpstoedit0c2a libgsf-1-114 libllvm2.7
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
  ppa-purge
0 upgraded, 1 newly installed, 0 to remove and 13 not upgraded.
Need to get 5,218B of archives.
After this operation, 57.3kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu/ maverick/universe ppa-purge all 0.2.7.1+bzr53 [5,218B]
Fetched 5,218B in 3s (1,422B/s)
Selecting previously deselected package ppa-purge.
(Reading database ... 175880 files and directories currently installed.)
Unpacking ppa-purge (from .../ppa-purge_0.2.7.1+bzr53_all.deb) ...
Processing triggers for man-db ...
Setting up ppa-purge (0.2.7.1+bzr53) ...
sukhendu@sukhendu:~$ sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa
PPA to be removed: ubuntu-mozilla-daily ppa
Package revert list generated:
 firefox-trunk/maverick firefox-trunk-globalmenu/maverick

Disabling ubuntu-mozilla-daily PPA from
/etc/apt/sources.list.d/ubuntu-mozilla-daily-ppa-maverick.list
Updating packages lists
W: Failed to fetch http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/dists/maverick/main/source/Sources.gz 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/kubuntu-ppa/ppa./ubuntu/dists/maverick/main/binary-i386/Packages.gz 404 Not Found

E: Some index files failed to download, they have been ignored, or old ones used instead.
Warning: apt-get update failed for some reason
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Release 'maverick' for 'firefox-trunk' was not found
E: Release 'maverick' for 'firefox-trunk-globalmenu' was not found
Unable to find an archive "maverick" for the package "firefox-trunk"
Unable to find an archive "maverick" for the package "firefox-trunk-globalmenu"
Unable to find an archive "maverick" for the package "firefox-trunk"
Unable to find an archive "maverick" for the package "firefox-trunk-globalmenu"
The following packages will be REMOVED:
  clamav{u} clamav-base{u} clamav-freshclam{u} create-resources{u} dcraw{u} firefox-branding{u} freetds-common{u} karbon{u} kchart{u} kdelibs-data{u} kdelibs4c2a{u} kformula{u}
  koffice-data{u} koffice-libs{u} kplato{u} krita{u} krita-data{u} kthesaurus{u} kword-data{u} libart-2.0-2{u} libavahi-qt3-1{u} libclamav6{u} libglew1.5{u} libgsf-1-114{u}
  libgsf-1-common{u} libgsl0ldbl{u} libgtlcore0.7{u} libllvm2.7{u} liblua50{u} liblualib50{u} libmagick++3{u} libopenctl0.7{u} libopenshiva0.7{u} libplot2c2{u} libpqxx-3.0{u}
  libpstoedit0c2a{u} libqt3-mt{u} libqtshiva0.1{u} librcps0{u} libruby1.8{u} libsybdb5{u} libtommath0{u} libxbase2.0-0{u} pstoedit{u} ruby{u} ruby1.8{u}
0 packages upgraded, 0 newly installed, 46 to remove and 9 not upgraded.
Need to get 0B of archives. After unpacking 170MB will be freed.
Do you want to continue? [Y/n/?]

Now should I remove all of these ?
I am confused as lot of packges going to remove.

Thanks Eliah Kagan, that solved my question.