Manually Installing Agent
So I downloaded Solaris_x64_Grid_Control_agent_download_10_2_0_5_0.zip to Mugello:$ORACLE_HOME/sysman/agent_download. Then
$ORACLE_HOME/bin/unzip Solaris_x64_Grid_Control_agent_download_10_2_0_5_0.zip
cd agent_download/10.2.0.5.0/solaris_x64/agent
mv agent_download.rsp.bak agent_download.rsp
export DISPLAY=<my desktop>:0.0
xhost +
./runInstaller &
When asked for host and port, I gave Fuji and the 1158 port number, which the OUI confirmed.