from the grommunio-setup.log:
2021-08-30 14:40:50 :: Welcome dialog
2021-08-30 14:41:10 :: Dialog: repository
2021-08-30 14:41:13 :: Installation / update of packages
2021-08-30 14:41:13 :: No valid subscription credentials provided
Retrieving repository 'base' metadata [.....................................................................................................................................Too few arguments.
At least one package name is required.
install (in) [OPTIONS] <CAPABILITY|RPM_FILE_URI> ...
Install packages with specified capabilities or RPM files with specified location. A capability is
NAME[.ARCH][OP<VERSION>], where OP is one of <, <=, =, >=, >.