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I'm running Ubuntu 11.04 machine. I had accidentally removed Python2.7.2 which I've sorted now, GUI is running and all other commands like easy_install, pip are working.

But when I type any apt commands like apt-get, apt-cache I get following error:

/usr/bin/python: can't find '_ _main _ _' module in '/usr/share/command-not-found'

How can I fix this?

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You are probably missing the command-not-found and command-not-found-data packages, try reinstalling these, if you cant reinstall them with apt-get, try using aptitude if you already have it installed. – nisshh Aug 1 '12 at 10:11
What happens when you try sudo apt-get -f install? – Mitch Aug 1 '12 at 10:31
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Adding to @nisshh's suggestion: if you have no aptitude installed, you could try downloading the packages from packages.ubuntu.com (command-not-found plus command-not-found-data) and install them manually using sudo dpkg -i command*.deb – Izzy Aug 1 '12 at 11:05
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Thanks everyone I have solved it. Basically it would give me same(given above) error no matter what try. So I logged out and pressed ALT+CTRL+F1 to enter tty1. There all the apt commands worked. Once I logged back in, I had issues with PATH variable which I had to export. – Mr Ghimire Aug 1 '12 at 11:38
Sounds like this is resolved. Please submit an answer and mark your question as answered. :) – Huckle Aug 5 '12 at 5:14

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Thanks everyone I have solved it.

Basically it would give me same error (error given above) no matter what try. So I logged out and pressed ALT+CTRL+F1 to enter tty1. There all the apt commands worked. Once I logged back in, I had issues with PATH variable which I had to export

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