There are two parts to this bug.
- in some cases, at the time shim-signed's postinst runs, there may be
linux-image packages installed for which one or more dkms modules are not
currently built. There are a number of legitimate reasons why this may be the
case, including unpack ordering during an upgrade. shim-signed needs to
gracefully handle the possibility that 'dkms uninstall' fails because the
module is not installed.
- the refactoring of the kernel packaging that landed in 4.15.0-19-generic has
a typo that prevents it from triggering dkms builds on installation. The
correct directory name is /etc/kernel/header_postinst.d/;
/var/lib/dpkg/info/linux-headers-4.15.0-19-generic.postinst references
/etc/kernel/headers_postinst.d which does not exist.
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Changed in: linux (Ubuntu)
Milestone: None => ubuntu-18.04
** Changed in: shim-signed (Ubuntu)
Status: Confirmed => Triaged
** Changed in: shim-signed (Ubuntu)
Importance: Undecided => Critical
** Changed in: shim-signed (Ubuntu)
Milestone: None => ubuntu-18.04
** Also affects: linux (Ubuntu Bionic)
Importance: Critical
Status: Triaged
** Also affects: shim-signed (Ubuntu Bionic)
Importance: Critical
Status: Triaged
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https://bugs.launchpad.net/bugs/1766391
Title:
package shim-signed (not installed) failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 5
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