Not particularly sure for the alpha release, however I was looking for for a similar answer with the release branch. I was running the following provided by the bigbluebutton/bbb-install documentation:
wget -qO- https://ubuntu.bigbluebutton.org/bbb-install.sh | sudo bash -s -- -w -v xenial-22 -s bbb.example.com -e notice@example.com
However, that always installs the latest BBB release.
After a bit of searching through the bbb dev google group, I found the following solution:
Update -v xenial-22
to -v xenial-220-2.2.27
, and I was able to install the particular version I was looking for, 2.2.27
.
I gave a small attempt to figure out the install tag for the alpha version, but I was unable to find anything for your use case in particular. If you did come across a solution, please share.
One thing to note, that because it is an alpha version, it is subject to breaking changes, which is why I haven't adapted to the 2.3 version until it is officially released. There's a chance that they just update the alpha release tag, without creating a new one, which could be why I couldn't find a particular tag for the version you were requesting. Ultimately, I believe you might need to reach out to the BBB dev google group, to determine the specific release tag.