That means it is not installed. Which is serious. It means you have either accidentally removed it - which is a big mistake - or it was never there in the first place which means your installation has failed. In both cases the likelihood is that you will have to reinstall but before you do that I have one other thing for you to try.
Run the command
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whereis aptitude
If you get results similar to apt-get then there is no need to proceed further - reinstall. (and download the iso again first - and check the md5 sum) However if it gives you something like this:
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aptitude: /usr/bin/aptitude /usr/bin/X11/aptitude /usr/share/aptitude /usr/share/man/man8/aptitude.8.gz
Which is what it should do, then try this command:
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sudo aptitude install apt
This will reinstall apt-get for you (along with any dependencies it needs that you are missing) and your software manager should then work.
Edit. There is another more manual way to do this using dpkg (if you have got dpkg that is ?) but it is extremely long winded as you have to manually install each dependency for apt. If you want to try it let me know.
Fujitsu Lifebook AH532 Laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Ubuntu12.10 (Unity), Mint14 (Cinnamon), Manjaro (Xfce).
