dpkg - error trying to install anything

Well, i jumped over to Lubuntu, and I'm on a fresh install of it... but I wanted to go ahead and install elementary to a flash drive and check it out, but cant because when I use terminal to install mkusb, I get this error:

dps@chris-pc:~$ sudo apt-get install mkusb mkusb-nox usb-pack-efi
[sudo] password for dps: 
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

Also, when I try to install anything via the software center (discovery) it says:

   PolicyKit Error
   Incorrect permissions on /usr/lib/policykit-1/polkit-agent-helper-1 (needs to be setuid root)

Any ideas?