Five users voted and the question was reopened.
I think you should vote to reopen even when you’re biased. It’s a good idea to add a comment for reviewers explaining why you think the question should be reopened, how dupes don’t match etc.
Asking on meta certainly brings attention to the question and your endeavor, but it is a bit much: A VTR which puts it in the review queue should rather be the way to approach the simple question “Should we reopen this or not?”, especially if you don’t need to raise points not fitting into a comment on the question.
For users under 3000 reputation
Even if you haven’t gained the privilege to cast reopen votes yet there are several things you can do:
Edit the question (directly or through a suggestion) and clarify why it is not a duplicate
An edit on a closed question automatically places it in the reopen queue where it’s considered for reopening by reviewers.
Ask a question on Meta
This is the right thing to do if you’re not sure about an edit. Include all information, especially why you think it isn’t a duplicate.
Ask in chat
Many experienced users and mods hang out in the Ask Ubuntu General Room, you’re welcome to join and ask about things like that.