APT_PM_STARTUP_CONCURRENCY

Set the APT_PM_STARTUP_CONCURRENCY environment variable to a small integer to determine the number of simultaneous section leader startups to be allowed.

Set APT_PM_STARTUP_CONCURRENCY to 1 forces sequential startup. The default is defined by SOMAXCONN in sys/socket.h (currently 5 for Solaris, 10 for AIX®).