I have been trying to get the SQL Express install to run in silent mode (/qb), but it is failing right after the "System Configuration Check". It jumps to "Setup Progress" and dies. If I run it without the /q it works fine.
I have also not been able to get the "/l" switch to work as expected.
It is possible that I have been going around and around with so long now that I am just missing something really simple.
Here is the command line that I am trying to use:
sqlexpr.exe /qb SECURITYMODE=SQL SAPWD=password DISABLENETWORKPROTOCOLS=2 instancename=MSSQLSERVER

SQL Express Silent Install
samdalil
As it turns out...I was missing something simple. You have to include the "ADDLOCAL" flag. For whatever reason this is not clear to me from reading the docs...