Cannot unpackage any software without an error in terminal

try running this before the command:
export PATH=/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

What is the output of:

cat /etc/issue; uname -a; echo $PATH; whoami

Thanks

Ubuntu 12.10 \n \l

Linux kla-Satellite-L450 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
kla

To Samuel:

bash: export: `apt-get': not a valid identifier

Please send us the full Terminal output of the following command:

which find ; ls -l /usr/bin/find ; sudo ls -l /usr/bin/find

Please also try the solution procedure here:

http://www.kubuntuforums.net/showthread.php?60122-find-not-found&s=1662aa212e33c22fad4ea189b8a96a43

ls: cannot access /usr/bin/find: No such file or directory
[sudo] password for kla:
kla is not in the sudoers file. This incident will be reported.

what is the output of:

/bin/cat /etc/issue

Thanks

Ubuntu 12.10 \n \l

Try:

sudo apt-get --reinstall install `dpkg -l | awk {'print $2'}`

Will download a lot but may help

Can't do it, I keep gettin this error for everything:

'kla is not in the sudoers file. This incident will be reported.'

What is the output of:

groups

Thanks

kla adm cdrom sudo dip plugdev lpadmin sambashare

Just put in the live CD and did a reinstall. Everything is working again I am able to sudo!