squid-deb-proxy-client-udeb broken in Ubuntu

Hello,

squid-deb-proxy-client-udeb doesn't work in Ubuntu. The problem is that the packages are in Universe and this repository is not searched during installation.

I added these stanzas to my preseed:
d-i anna/choose_modules string squid-deb-proxy-client-udeb
which tries to install the udeb package. Then I found I need to also enable the universe udeb repository, and that is fine:
d-i mirror/udeb/components multiselect main, restricted, universe

Now apt-install queues squid-deb-proxy-client for later installation, so the udeb package did its job.

Then, base-installer tries to install the package (squid-deb-proxy-client) but it fails and prints:
in-target: Unable to locate package squid-deb-proxy-client
base-installer: warning: Failed to install squid-deb-proxy-client into /target/: 100

I stopped the installer at this point. The /target/etc/apt/sources.list only contains the main and restricted components. When you read the base-installer package's 'library.sh' file it's obvious. Base-installer enables main and restricted, but only if the apt-setup/restricted boolean is true. So even if you have these in your preseed:
d-i apt-setup/restricted boolean true
d-i apt-setup/universe boolean true
d-i apt-setup/multiverse boolean true
d-i apt-setup/partner boolean true
base-installer will skip universe and squid-deb-proxy-client will not get installed.

I believe the same configuration might actually work in Debian, as this package would sit in its main archive.

In Ubuntu, the squid-deb-proxy-client-udeb should position its installation after apt-setup configures the other repositories.

Please let me know if it is me missing some piece of config or if it worked in any scenario of yours.

Cheers,
Ballock