Look for this in synaptic package manager
$ apt-cache policy opera-developer
opera-developer:
Installed: 33.0.1967.0
Candidate: 33.0.1967.0
Version table:
*** 33.0.1967.0 0
500 http://deb.opera.com/opera-developer/ stable/non-free amd64 Packages
100 /var/lib/dpkg/status
I don't wish to remove mine but I will show a simulation of a command line uninstall.
$ sudo apt-get -s remove opera-developer
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
opera-developer
0 upgraded, 0 newly installed, 1 to remove and 40 not upgraded.
Remv opera-developer [33.0.1967.0]
sudo apt-get opera-developer without using -s switch will uninstall opera via command line. Or use synaptic package manager to uninstall it.