I'm not the original reporter, but I hit (and analyzed) what seems to be the same failure in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1820755
I just switched our packer template over to -proposed to test this: i.e. changed it to use http://archive.ubuntu.com/ubuntu/dists/xenial- proposed/main/installer- amd64/20101020ubuntu451.28/images/netboot/mini.iso, added apt- setup/proposed=true to the kernel command-line) and I can confirm that this runs to completion (whereas xenial- updates/current/images/netboot/mini.iso errors out. debootstrap still initially installs the original xenial version of linux-base (but that's expected, since debootstrap is unable to look at multiple repositories), but it eventually gets upgraded debootstrap: Preparing to unpack .../linux-base_4.0ubuntu1_all.deb ... debootstrap: Unpacking linux-base (4.0ubuntu1) ... ... debootstrap: Setting up linux-base (4.0ubuntu1) ... ... but later on (once base-installer is doing the kernel using the real in-target apt-get) it picks up the new kernel from xednial-proposed, and that prods it to pick up the new linux-base from xenial-updates ... in-target: The following additional packages will be installed: in-target: linux-base linux-headers-4.4.0-145 linux-headers-4.4.0-145-generic in-target: linux-headers-generic linux-headers-virtual linux-image-4.4.0-145-generic in-target: linux-image-virtual linux-modules-4.4.0-145-generic in-target: Suggested packages: in-target: fdutils linux-doc-4.4.0 | linux-source-4.4.0 linux-tools in-target: Recommended packages: in-target: grub-pc | grub-efi-amd64 | grub-efi-ia32 | grub | lilo in-target: The following NEW packages will be installed: in-target: linux-headers-4.4.0-145 linux-headers-4.4.0-145-generic in-target: linux-headers-generic linux-headers-virtual linux-image-4.4.0-145-generic in-target: linux-image-virtual linux-modules-4.4.0-145-generic linux-virtual in-target: The following packages will be upgraded: in-target: linux-base in-target: 1 upgraded, 8 newly installed, 0 to remove and 98 not upgraded. in-target: Need to get 29.8 MB of archives. in-target: After this operation, 146 MB of additional disk space will be used. in-target: Get:1 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 linux-base all 4.5ubuntu1~16.04.1 [18.1 kB] in-target: Get:2 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-headers-4.4.0-145 all 4.4.0-145.171 [10.0 MB] in-target: Get:3 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-headers-4.4.0-145-generic amd64 4.4.0-145.171 [820 kB] in-target: Get:4 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-headers-generic amd64 4.4.0.145.153 [2,568 B] in-target: Get:5 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-headers-virtual amd64 4.4.0.145.153 [1,760 B] in-target: Get:6 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-modules-4.4.0-145-generic amd64 4.4.0-145.171 [12.0 MB] in-target: Get:7 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-image-4.4.0-145-generic amd64 4.4.0-145.171 [6,919 kB] in-target: Get:8 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-image-virtual amd64 4.4.0.145.153 [2,694 B] in-target: Get:9 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 linux-virtual amd64 4.4.0.145.153 [1,778 B] ... and it unpacks that first ... in-target: Preparing to unpack .../linux-base_4.5ubuntu1~16.04.1_all.deb ... in-target: in-target: Unpacking linux-base (4.5ubuntu1~16.04.1) over (4.0ubuntu1) ... ... in-target: Setting up linux-base (4.5ubuntu1~16.04.1) ... ...and the symlinks in postinst work ... in-target: Setting up linux-image-4.4.0-145-generic (4.4.0-145.171) ...^M in-target: I: /vmlinuz.old is now a symlink to boot/vmlinuz-4.4.0-145-generic^M in-target: I: /initrd.img.old is now a symlink to boot/initrd.img-4.4.0-145-generic^M in-target: I: /vmlinuz is now a symlink to boot/vmlinuz-4.4.0-145-generic^M in-target: I: /initrd.img is now a symlink to boot/initrd.img-4.4.0-145-generic^M in-target: Setting up linux-image-virtual (4.4.0.145.153) ...^M in-target: Setting up linux-virtual (4.4.0.145.153) ...^M So... I don't know if you need verification from the original reporter too, but it looks good to me. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1820419 Title: linux-generic should depend on linux-base >=4.1 Status in linux package in Ubuntu: Invalid Status in linux source package in Xenial: In Progress Bug description: [ SRU Justification ] == Impact == Due to unversioned dependencies to linux-base, minimal installations will not pull in the latest requirements. == Fix == Depend on linux-base (>= 4.5ubuntu1~16.04.1) specifically == Testcase == See below (but also can be checked on dependencies). == Risk of Regression == Low, no actual code change. --- Hi, we run a automated pipeline which automatically installs ubuntu 16.04 by pxe / netinstall. This pipeline stopped working tonight, so I did some research. Looks like linux-generic depends on linux-base, but requires a tool/script which was added in 4.1 (linux-update-symlinks). packages.ubuntu.com only shows linux-base 4.5, but if I take a look into the packages.gz of <mirror>/ubuntu/ there is still a 4.0 available. So somehow(tm) it seems netinstall is installing the 4.0 version of linux-base instead of the required 4.5 (4.1+). In my opinion if a pkg needs a feature which is only available in a newer version of a pkg, this pkg should be a depend, so linux-generic should depend on linux-base >= 4.1 instead of just depend on linux- base. I workarounded the problem by installing the hwe-kernel which has a correct dependency on linux-base 4.5. 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