Comment 1 for bug 1815137

Addendum:

$ uname -a
Linux NEXUS-ONE 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

/var/log/apt/term.log:

Log started: 2019-02-07 22:28:42
(Reading database ... 410996 files and directories currently installed.)
Preparing to unpack .../00-openssh-sftp-server_1%3a7.6p1-4ubuntu0.2_amd64.deb ...
Unpacking openssh-sftp-server (1:7.6p1-4ubuntu0.2) over (1:7.6p1-4ubuntu0.1) ...
Preparing to unpack .../01-openssh-server_1%3a7.6p1-4ubuntu0.2_amd64.deb ...
Unpacking openssh-server (1:7.6p1-4ubuntu0.2) over (1:7.6p1-4ubuntu0.1) ...
Preparing to unpack .../02-openssh-client_1%3a7.6p1-4ubuntu0.2_amd64.deb ...
Unpacking openssh-client (1:7.6p1-4ubuntu0.2) over (1:7.6p1-4ubuntu0.1) ...
Preparing to unpack .../03-grub-efi-amd64_2.02-2ubuntu8.11_amd64.deb ...
Unpacking grub-efi-amd64 (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
Preparing to unpack .../04-grub-efi-amd64-bin_2.02-2ubuntu8.11_amd64.deb ...
Unpacking grub-efi-amd64-bin (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
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Unpacking grub2-common (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
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Unpacking grub-common (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
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Unpacking libarchive13:amd64 (3.2.2-3.1ubuntu0.3) over (3.2.2-3.1ubuntu0.2) ...
Preparing to unpack .../08-libegl-mesa0_18.2.8-0ubuntu0~18.04.1_i386.deb ...
De-configuring libegl-mesa0:amd64 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libegl-mesa0:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../09-libegl-mesa0_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libegl-mesa0:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../10-libgbm1_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
De-configuring libgbm1:i386 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libgbm1:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../11-libgbm1_18.2.8-0ubuntu0~18.04.1_i386.deb ...
Unpacking libgbm1:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../12-libosmesa6_18.2.8-0ubuntu0~18.04.1_i386.deb ...
De-configuring libosmesa6:amd64 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libosmesa6:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../13-libosmesa6_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libosmesa6:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../14-libgl1-mesa-dri_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
De-configuring libgl1-mesa-dri:i386 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libgl1-mesa-dri:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../15-libgl1-mesa-dri_18.2.8-0ubuntu0~18.04.1_i386.deb ...
Unpacking libgl1-mesa-dri:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../16-libglx-mesa0_18.2.8-0ubuntu0~18.04.1_i386.deb ...
De-configuring libglx-mesa0:amd64 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libglx-mesa0:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../17-libglx-mesa0_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libglx-mesa0:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../18-libglapi-mesa_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
De-configuring libglapi-mesa:i386 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libglapi-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../19-libglapi-mesa_18.2.8-0ubuntu0~18.04.1_i386.deb ...
Unpacking libglapi-mesa:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../20-libegl1-mesa_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libegl1-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../21-libgl1-mesa-dev_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libgl1-mesa-dev:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
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Unpacking libegl1-mesa-dev:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../23-mesa-common-dev_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking mesa-common-dev:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../24-libgl1-mesa-glx_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
De-configuring libgl1-mesa-glx:i386 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libgl1-mesa-glx:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../25-libgl1-mesa-glx_18.2.8-0ubuntu0~18.04.1_i386.deb ...
Unpacking libgl1-mesa-glx:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../26-libwayland-egl1-mesa_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
De-configuring libwayland-egl1-mesa:i386 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking libwayland-egl1-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../27-libwayland-egl1-mesa_18.2.8-0ubuntu0~18.04.1_i386.deb ...
Unpacking libwayland-egl1-mesa:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../28-libxatracker2_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking libxatracker2:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../29-mesa-va-drivers_18.2.8-0ubuntu0~18.04.1_i386.deb ...
De-configuring mesa-va-drivers:amd64 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking mesa-va-drivers:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../30-mesa-va-drivers_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking mesa-va-drivers:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../31-mesa-vdpau-drivers_18.2.8-0ubuntu0~18.04.1_i386.deb ...
De-configuring mesa-vdpau-drivers:amd64 (18.2.2-0ubuntu1~18.04.1) ...
Unpacking mesa-vdpau-drivers:i386 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../32-mesa-vdpau-drivers_18.2.8-0ubuntu0~18.04.1_amd64.deb ...
Unpacking mesa-vdpau-drivers:amd64 (18.2.8-0ubuntu0~18.04.1) over (18.2.2-0ubuntu1~18.04.1) ...
Preparing to unpack .../33-ssh-askpass-gnome_1%3a7.6p1-4ubuntu0.2_amd64.deb ...
Unpacking ssh-askpass-gnome (1:7.6p1-4ubuntu0.2) over (1:7.6p1-4ubuntu0.1) ...
Processing triggers for ufw (0.35-5) ...
Setting up mesa-common-dev:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libarchive13:amd64 (3.2.2-3.1ubuntu0.3) ...
Setting up mesa-vdpau-drivers:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up mesa-vdpau-drivers:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libgbm1:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libgbm1:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libglapi-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libglapi-mesa:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libxatracker2:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libgl1-mesa-dev:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up grub-common (2.02-2ubuntu8.11) ...
Installing new version of config file /etc/grub.d/00_header ...
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Setting up mesa-va-drivers:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up mesa-va-drivers:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libwayland-egl1-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libwayland-egl1-mesa:i386 (18.2.8-0ubuntu0~18.04.1) ...
Processing triggers for systemd (237-3ubuntu10.12) ...
Setting up libegl1-mesa-dev:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Setting up libegl-mesa0:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libegl-mesa0:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up openssh-client (1:7.6p1-4ubuntu0.2) ...
Setting up libegl1-mesa:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up grub-efi-amd64-bin (2.02-2ubuntu8.11) ...
Setting up libosmesa6:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libosmesa6:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libgl1-mesa-dri:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Installing new version of config file /etc/drirc ...
Setting up libgl1-mesa-dri:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up grub2-common (2.02-2ubuntu8.11) ...
Setting up ssh-askpass-gnome (1:7.6p1-4ubuntu0.2) ...
Setting up openssh-sftp-server (1:7.6p1-4ubuntu0.2) ...
Setting up libglx-mesa0:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libglx-mesa0:i386 (18.2.8-0ubuntu0~18.04.1) ...
Setting up grub-efi-amd64 (2.02-2ubuntu8.11) ...
/var/lib/dpkg/info/grub-efi-amd64.postinst: line 324: /usr/share/grub/grub-check-signatures: Permission denied
dpkg: error processing package grub-efi-amd64 (--configure):
 installed grub-efi-amd64 package post-installation script subprocess returned error exit status 126
Setting up openssh-server (1:7.6p1-4ubuntu0.2) ...
Setting up libgl1-mesa-glx:amd64 (18.2.8-0ubuntu0~18.04.1) ...
Setting up libgl1-mesa-glx:i386 (18.2.8-0ubuntu0~18.04.1) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Errors were encountered while processing:
 grub-efi-amd64
Log ended: 2019-02-07 22:28:51