no space on device error

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http://www.backtrack-linux.org – I create an Oracle VirtualBox and load BT5 R1 x64 - Following apparent successful load I open terminal and run apt-get update - Next I run apt-get dist-upgrade [-u] - When unpacking mantra pkg I observe 'no space on device errors' - Have I attempted too many update/upgrades at one time? Is my environment needing some tweaking? TIA to all who guide me ! (HowTos)