Если еще актуально, то в конце инструкции есть описание как установить гемы через прокси и продолжить установку!!! Там скрипт есть и описание что нужно поправить чтоб при установке он их не проверял!!!
Unable to install gems
The install script for bbb-record-core needs to install a number of ruby gems. However, if you are behind a HTTP_PROXY, then the install script for bbb-record-core will likely exit with an error. This occurs because the bash environment for bbb-record-core will not have a value for HTTP_PROXY.
You can resolve this by manually installing the gems using the following script.
#!/bin/bash
export HTTP_PROXY="<your_http_proxy>"
gem install --http-proxy $HTTP_PROXY builder -v 2.1.2
gem install --http-proxy $HTTP_PROXY diff-lcs -v 1.1.2
gem install --http-proxy $HTTP_PROXY json -v 1.4.6
gem install --http-proxy $HTTP_PROXY term-ansicolor -v 1.0.5
gem install --http-proxy $HTTP_PROXY gherkin -v 2.2.9
gem install --http-proxy $HTTP_PROXY cucumber -v 0.9.2
gem install --http-proxy $HTTP_PROXY curb -v 0.7.15
gem install --http-proxy $HTTP_PROXY mime-types -v 1.16
gem install --http-proxy $HTTP_PROXY nokogiri -v 1.4.4
gem install --http-proxy $HTTP_PROXY open4 -v 1.3
gem install --http-proxy $HTTP_PROXY rack -v 1.2.2
gem install --http-proxy $HTTP_PROXY redis -v 2.1.1
gem install --http-proxy $HTTP_PROXY redis-namespace -v 0.10.0
gem install --http-proxy $HTTP_PROXY tilt -v 1.2.2
gem install --http-proxy $HTTP_PROXY sinatra -v 1.2.1
gem install --http-proxy $HTTP_PROXY vegas -v 0.1.8
gem install --http-proxy $HTTP_PROXY resque -v 1.15.0
gem install --http-proxy $HTTP_PROXY rspec-core -v 2.0.0
gem install --http-proxy $HTTP_PROXY rspec-expectations -v 2.0.0
gem install --http-proxy $HTTP_PROXY rspec-mocks -v 2.0.0
gem install --http-proxy $HTTP_PROXY rspec -v 2.0.0
gem install --http-proxy $HTTP_PROXY rubyzip -v 0.9.4
gem install --http-proxy $HTTP_PROXY streamio-ffmpeg -v 0.7.8
gem install --http-proxy $HTTP_PROXY trollop -v 1.16.2
Once all the gems are installed, you need to tell BigBlueButton install scripts bbb-record-core to not try to install the gems anymore. Edit the file /var/lib/dpkg/info/bbb-record-core.preinst and comment out the line
# gem install $gem
Then run
sudo apt-get install -f