Incomplete sentence during install check

Binary package hint: ubiquity

During installation, "Preparing to install Ubuntu" screen mentions:

For best results, please ensure:
 ✔ has at least 2.5 GB available drive space
 ✔ is plugged in to a power source
 ✔ is connected to the Internet

Ensure what/which? (has at least.. , is plugged.. , is connected.. )

Either we need to mention " ...ensure Computer" (or System, or whatever)
Or we drop 'has' , 'is' and form the options accordingly.

ProblemType: BugDistroRelease: Ubuntu 11.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 2.6.37-11.25-generic 2.6.37-rc7
Uname: Linux 2.6.37-11-generic i686
Architecture: i386
Date: Sat Dec 25 18:40:14 2010InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20101224)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bashSourcePackage: ubiquity