[Users] How-to upgrade a Ubuntu-8.04 LTS VE to a 10.04 VE?

[Michael Chinn]

Greetings:

I run Debian-5 (Lenny) as my OpenVZ host OS with 3 Ubuntu-8.04 LTS VE's 
and a Debian-5 VE.

Question: I'd like to upgrade the production 8.04 VE's to 10.04.

Can this be done?

I tried searching but couldn't find a definitive (recommended) procedure 
for performing a "distribution upgrade" to production VE's.

Is there such a procedure?

Thanks.
Michael

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Michael Chinn
Miguel(dot)Chinn(at)Gmail(dot)com