Hope that you are doing well!

system :

Ubuntu 18.04.3 LTS

when trying to start the osmocom CNI using the osmo-all script i will get :

./osmo-all.sh restart
+ systemctl restart osmo-hlr osmo-msc osmo-mgw osmo-ggsn osmo-sgsn osmo-stp osmo-bsc osmo-hnbgw osmo-bts-sysmo osmo-pcu
Failed to restart osmo-bts-sysmo.service: Unit osmo-bts-sysmo.service not found.

so seems that osmo-bts it's not installed,wjen i try to install it will get :

sudo apt-get install osmo-bts

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
osmo-bts : Depends: libosmoabis5 (>= 0.3.2+20151106git86fc3c8) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

and when trying to install libosmoabis5 i will get :

sudo apt-get install libosmoabis5
The following packages will be REMOVED:
libosmo-gsup-client0 libosmoabis6 osmo-bsc osmo-bts-trx osmo-bts-virtual
osmo-hlr osmo-msc osmo-sgsn
The following NEW packages will be installed:
libosmoabis5
0 upgraded, 1 newly installed, 8 to remove and 0 not upgraded.

thanks in advnace!