since OsmoBTS seemed a bit buggy, i've set up OpenBTS too.
just download ubuntu 14.04 x86 and install the binary packages from OpenBTS.
you will need to install 2 packages manually before that, since they are very old and only in the ubuntu 12.xx repos, but i wouldn't recommend using this old ubuntu version. other dependecies can be installed with
sudo apt-get -f install. if anyone had success installing OpenBTS on newer versions of ubuntu; let us know. i just read, that there are some problems and therefore went for 14.04.
you can download the packages here:
simply install osmo-trx as described in the myriadrf wiki and run the folling command for OpenBTS compatibilty:
osmo-trx -e -a 'soapy=0,driver=lime' -f // you can simply type
osmo-trx -e -a -f too, if you only have one sdr connected