This is not the problem of debconf. After dpkg started unpacking the package it froze, and some mimutes later the terminal gave "NMI watch dog soft lockup" errors.
I added "acpi=off" to GRUB boot options and I succeeded in installing this package. Before turning off ACPI, runing "lspci" always stopped forever, and I noticed the preinstall scripts has "lspci" usage, so maybe that was the problem.
