Hi,
even if you could somehow achieve that, it is not recommended (and I don't think it's possible).
If you read the
docs carefully (please DO read thoroughly), BBB 2.6/2.7 can only be installed in Ubuntu 20.04, wheras BBB 3.0 needs Ubuntu 22.04.
Also, it's written right there: "We recommend installing BigBlueButton with a 'clean' and dedicated Ubuntu 22.04" (BBB 3.0).
Regards,
J.