Bug#737170: debian-installer: hd-media installer says it didn't find ISO image, modprobe error in the logs

[Flavio Stanchina <flavio@stanchina.net>]

Package: debian-installer
Version: 20130613+deb7u1+b1
Severity: important

I'm trying to build a bootable USB stick with the "hd-media" image at:
http://ftp.it.debian.org/debian/dists/wheezy/main/installer-amd64/current/images/hd-media/boot.img.gz

....plus the debian-7.3.0-amd64-i386-netinst.iso CD image. The installer
doesn't find the ISO image, here's an excerpt from the syslog:

Jan 30 21:04:35 iso-scan: Found ISO ./debian-7.3.0-amd64-i386-netinst.iso on /dev/sda1
Jan 30 21:04:35 kernel: [    5.367123] ISO 9660 Extensions: Microsoft Joliet Level 3
Jan 30 21:04:35 kernel: [    5.368754] ISO 9660 Extensions: RRIP_1991A
Jan 30 21:04:35 iso-scan: Detected ISO with 'stable' (wheezy) distribution
Jan 30 21:04:35 iso-scan: Detected ISO with distribution 'stable' (wheezy)
Jan 30 21:04:35 iso-scan: Debian ISO ./debian-7.3.0-amd64-i386-netinst.iso usable
Jan 30 21:04:35 main-menu[251]: (process:1281): modprobe: invalid option -- 'l'
Jan 30 21:04:35 main-menu[251]: WARNING **: Configuring 'iso-scan' failed with error code 1
Jan 30 21:04:35 main-menu[251]: WARNING **: Menu item 'iso-scan' failed.

I verified that the modprobe tool used in the squeeze installer did in fact
have a -l option (it listed all available modules), but now it doesn't.
Busybox's modprobe also has a -l option.