To uninstall a package (Ex: tor) installed from repository one should use

sudo apt-get remove tor

I did this but dpkg -l | grep tor shown something against the package. Next I try

sudo apt-get purge tor

But when I check dpkg -l | grep tor I got,

reza@reza-N43JM:/$ dpkg -l tor    

Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend

|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

||/ Name           Version        Description

+++-==============-==============-============================================

un  tor            <none>         (no description available)

I think when I uninstall any package I should not get anything in dpkg -l list. Is it true? Or apt-get remove or purge does another work but not uninstall?