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If the past is anything to go by, there will be a version of Parallels tools that works with Ubuntu 8.10 slightly before 9.04 comes out...if...
Even if VMWare doesn't provide free upgrades for the Workstation (Windows/Linux) version, they still provide free upgrades to Fusion whereas...
Not worth the upgrade I've been using Parallels since it was first officially released, and I have to say I'm very disappointed with the support....