Comment 1 for bug 1522469

Indeed the apt pinning is wrong here:

# apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 3.13.0.71.77
  Candidate: 3.13.0.71.77
  Version table:
     3.13.0.72.78 0
        800 http://de.archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
 *** 3.13.0.71.77 0
        900 http://de.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.13.0.24.28 0
        900 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

# cat /etc/apt/preferences.d/autopkgtest-trusty-proposed
Package: linux-crashdump linux-generic-lpae-lts-saucy linux-generic-lpae-lts-saucy-eol-upgrade linux-generic-lts-quantal linux-generic-lts-quantal-eol-upgrade linux-generic-lts-raring linux-generic-lts-raring-eol-upgrade linux-generic-lts-saucy linux-generic-lts-saucy-eol-upgrade linux-headers-generic-lpae-lts-saucy linux-headers-generic-lts-quantal linux-headers-generic-lts-raring linux-headers-generic-lts-saucy linux-hwe-generic-trusty linux-hwe-virtual-trusty linux-image-generic-lpae-lts-saucy linux-image-generic-lts-quantal linux-image-generic-lts-raring linux-image-generic-lts-saucy linux-image-hwe-generic-trusty linux-image-hwe-virtual-trusty linux-signed-generic-lts-quantal linux-signed-generic-lts-quantal-eol-upgrade linux-signed-generic-lts-raring linux-signed-generic-lts-raring-eol-upgrade linux-signed-image-generic-lts-quantal linux-signed-image-generic-lts-raring linux-signed-image-generic-lts-saucy linux-source linux-tools-generic-lpae-lts-saucy linux-tools-generic-lts-saucy linux-tools-lts-quantal linux-tools-lts-raring linux-tools-lts-saucy
Pin: release a=trusty-proposed
Pin-Priority: 990

Package: *
Pin: release a=trusty
Pin-Priority: 900

Package: *
Pin: release a=trusty-updates
Pin-Priority: 900

Package: *
Pin: release a=trusty-proposed
Pin-Priority: 800

Indeed "linux-image-generic" is clearly missing from the binary package list there.