Update to 2.02ubuntu8.11 fails.

[Videonauth]

Today running an apt dist-upgrade i was prompted with this error:

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
Errors were encountered while processing:
 grub-efi-amd64
E: Sub-process /usr/bin/dpkg returned an error code (1)

[Videonauth (videonauth)]

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) ...
Preparing to unpack .../05-grub2-common_2.02-2ubuntu8.11_amd64.deb ...
Unpacking grub2-common (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
Preparing to unpack .../06-grub-common_2.02-2ubuntu8.11_amd64.deb ...
Unpacking grub-common (2.02-2ubuntu8.11) over (2.02-2ubuntu8.10) ...
Preparing to unpack .../07-libarchive13_3.2.2-3.1ubuntu0.3_amd64.deb ...
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:i38...

[Brian Murray (brian-murray)]

grub2 (2.02-2ubuntu8.12) bionic; urgency=medium

  * debian/grub-check-signatures: make sure grub-check-signatures conserves
    its execute bit.