[Bug 1797557] Re: Bionic updates break upgrade (apt remove libc6-armhf-cross first)

[TJ]

Removing the package causes a lot of churn even on a minimal cross-build
install:

$ sudo apt remove libc6-armhf-cross
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  binutils-arm-linux-gnueabihf cpp-7-arm-linux-gnueabihf cpp-arm-linux-gnueabihf gcc-4.7-arm-linux-gnueabihf-base
  gcc-7-arm-linux-gnueabihf-base gcc-7-cross-base gcc-8-cross-base linux-libc-dev-armhf-cross
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED
  g++-7-arm-linux-gnueabihf g++-arm-linux-gnueabihf gcc-7-arm-linux-gnueabihf gcc-arm-linux-gnueabihf libasan4-armhf-cross
  libatomic1-armhf-cross libc6-armhf-cross libc6-dev-armhf-cross libcilkrts5-armhf-cross libgcc-4.7-dev-armhf-cross
  libgcc-7-dev-armhf-cross libgcc1-armhf-cross libgomp1-armhf-cross libstdc++-7-dev-armhf-cross libstdc++6-4.7-dev-armhf-cross
  libstdc++6-armhf-cross libubsan0-armhf-cross
0 to upgrade, 0 to newly install, 17 to remove and 0 not to upgrade.
After this operation, 79.2 MB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.

With 93 packages listed directly as reverse-depends it has the potential
to make quite a mess.

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https://bugs.launchpad.net/bugs/1797557

Title:
  Bionic updates break upgrade (apt remove libc6-armhf-cross first)

Status in cross-toolchain-base package in Ubuntu:
  Triaged

Bug description:
  As I reported in comments on the end of Bug #1769657 "update toolchain
  packages for bionic" on 5th October 2018 the updates have broken the
  ability to upgrade package(s). Specifically, the 'dpkg --unpack' stage
  breaks because, from what I can tell, some of the .dpkg-new files are
  being deleted before they are due to be renamed:

  $ sudo dpkg --unpack /var/cache/apt/archives/libc6-armhf-cross_2.27-3ubuntu1cross1.1_all.deb |& tee /tmp/dpkg-unpack.log
  (Reading database ... 406492 files and directories currently installed.)
  Preparing to unpack .../libc6-armhf-cross_2.27-3ubuntu1cross1.1_all.deb ...
  Unpacking libc6-armhf-cross (2.27-3ubuntu1cross1.1) over (2.27-3ubuntu1cross1) ...
  dpkg: error processing archive /var/cache/apt/archives/libc6-armhf-cross_2.27-3ubuntu1cross1.1_all.deb (--unpack):
   unable to open '/usr/arm-linux-gnueabihf/lib/ld-2.27.so.dpkg-new': No such file or directory
  Errors were encountered while processing:
   /var/cache/apt/archives/libc6-armhf-cross_2.27-3ubuntu1cross1.1_all.deb

  $ sudo dpkg --unpack /var/cache/apt/archives/libc6-dev-armhf-cross_2.27-3ubuntu1cross1.1_all.deb |& tee /tmp/dpkg-unpack.log
  (Reading database ... 406492 files and directories currently installed.)
  Preparing to unpack .../libc6-dev-armhf-cross_2.27-3ubuntu1cross1.1_all.deb ...
  Unpacking libc6-dev-armhf-cross (2.27-3ubuntu1cross1.1) over (2.27-3ubuntu1cross1) ...
  dpkg: error processing archive /var/cache/apt/archives/libc6-dev-armhf-cross_2.27-3ubuntu1cross1.1_all.deb (--unpack):
   unable to open '/usr/arm-linux-gnueabihf/lib/Mcrt1.o.dpkg-new': No such file or directory
  Errors were encountered while processing:
   /var/cache/apt/archives/libc6-dev-armhf-cross_2.27-3ubuntu1cross1.1_all.deb

  $ apt-cache policy libc6-armhf-cross
  libc6-armhf-cross:
    Installed: 2.27-3ubuntu1cross1
    Candidate: 2.27-3ubuntu1cross1.1
    Version table:
       2.27-3ubuntu1cross1.1 500
          500 http://gb.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://gb.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
   *** 2.27-3ubuntu1cross1 500
          500 http://gb.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://gb.archive.ubuntu.com/ubuntu bionic/main i386 Packages
          100 /var/lib/dpkg/status

  I've analysed both failures using a combination of 'dpkg --debug
  77777', strace, and inotifywait, but I've not familiar enough with the
  dpkg logic to determine what is going wrong.

  I'm attaching debug, strace and inotifywait logs for 'libc6-armhf-
  cross' where 'ld-2.27.so.dpkg-new' appears to be the problem.

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