Expand on apt issue/workaround and correct affected Debian suites

addpkg=pciutils,build-essential,git-core,subversion,$LOCALE_PKG,wget,lsb-release

if [ $DISTRO = "ubuntu" ]; then

  # Need comma at end to work around an issue with apt for Debian <= Squeeze regarding empty strings

  # Need comma at end to work around an issue with apt for Debian <= Wheezy regarding empty strings

  #

  # If we left the comma down below when adding KERNEL_PKG to addpkg, the fact that KERNEL_PKG is undefined

  # if DISTRO is debian would result in two commas in a row (,,), which is interpreted by apt-get as the

  # package with the name empty string (""). This triggers a bug with apt versions < 1.0.3. So by adding the

  # comma to the end of KERNEL_PKG, we are including that comma if the distro is ubuntu (and therefore we do

  # have a kernel package that needs to be installed). If KERNEL_PKG is not set (i.e. we have Debian as the

  # distro), then we don't add that extra comma and therefore, we don't end up with two commas in a row.

  #

  # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=744940

  # http://anonscm.debian.org/cgit/apt/apt.git/commit/?h=1.0.3&id=d99854cac4065bc7b337815fb2116269d58dab73

  KERNEL_PKG=linux-image-generic,