[Bug 2121763] Re: /etc/default/grub: Syntax error: EOF in backquote substitution

[Launchpad Bug Tracker]

[Expired for grub2 (Ubuntu) because there has been no activity for 60
days.]

** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/2121763

Title:
  /etc/default/grub: Syntax error: EOF in backquote substitution

Status in grub2 package in Ubuntu:
  Expired

Bug description:
  [sudo] password for a: 
  Hit:1 https://ppa.launchpadcontent.net/helkaluin/webp-pixbuf-loader/ubuntu jammy InRelease
  Hit:2 https://ppa.launchpadcontent.net/jurplel/qview/ubuntu jammy InRelease    
  Hit:3 http://gb.archive.ubuntu.com/ubuntu jammy InRelease                      
  Hit:4 http://gb.archive.ubuntu.com/ubuntu jammy-updates InRelease              
  Hit:5 http://gb.archive.ubuntu.com/ubuntu jammy-backports InRelease        
  Get:6 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security InRelease [7,613 B]
  Get:7 http://security.ubuntu.com/ubuntu jammy-security InRelease [129 kB]
  Get:8 https://esm.ubuntu.com/apps/ubuntu jammy-apps-updates InRelease [7,468 B]
  Get:9 https://esm.ubuntu.com/infra/ubuntu jammy-infra-security InRelease [7,462 B]
  Get:10 https://esm.ubuntu.com/infra/ubuntu jammy-infra-updates InRelease [7,461 B]
  Get:11 http://security.ubuntu.com/ubuntu jammy-security/main amd64 DEP-11 Metadata [54.6 kB]
  Get:12 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 DEP-11 Metadata [208 B]
  Get:13 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 DEP-11 Metadata [125 kB]
  Get:14 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 DEP-11 Metadata [208 B]
  Fetched 339 kB in 2s (223 kB/s)            
  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  All packages are up-to-date.
  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  Calculating upgrade... Done
  0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
  2 not fully installed or removed.
  After this operation, 0 B of additional disk space will be used.
  Setting up linux-image-6.8.0-78-generic (6.8.0-78.78~22.04.1) ...
  Setting up linux-image-6.8.0-79-generic (6.8.0-79.79~22.04.1) ...
  Processing triggers for linux-image-6.8.0-78-generic (6.8.0-78.78~22.04.1) ...
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-6.8.0-78-generic
  /etc/kernel/postinst.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  /usr/sbin/grub-mkconfig: 34: /etc/default/grub: Syntax error: EOF in backquote s
  ubstitution
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2
  dpkg: error processing package linux-image-6.8.0-78-generic (--configure):
   installed linux-image-6.8.0-78-generic package post-installation script subproc
  ess returned error exit status 1
  Processing triggers for linux-image-6.8.0-79-generic (6.8.0-79.79~22.04.1) ...
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-6.8.0-79-generic
  /etc/kernel/postinst.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  /usr/sbin/grub-mkconfig: 34: /etc/default/grub: Syntax error: EOF in backquote s
  ubstitution
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2
  dpkg: error processing package linux-image-6.8.0-79-generic (--configure):
   installed linux-image-6.8.0-79-generic package post-installation script subproc
  ess returned error exit status 1
  Errors were encountered while processing:
   linux-image-6.8.0-78-generic
   linux-image-6.8.0-79-generic
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.20
  ProcVersionSignature: Ubuntu 6.8.0-65.68~22.04.1-generic 6.8.12
  Uname: Linux 6.8.0-65-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.10
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CrashReports:
   600:0:124:167272:2025-08-29 08:24:48.886222907 +0100:2025-08-30 10:52:40.506338649 +0100:/var/crash/linux-image-6.8.0-64-generic.0.crash
   644:0:124:0:2025-08-28 09:14:39.993086403 +0100:2025-08-28 09:14:39.993086403 +0100:/var/crash/linux-image-6.8.0-78-generic.0.upload
   600:117:124:37:2025-08-28 09:14:41.179049549 +0100:2025-08-28 09:14:41.179049549 +0100:/var/crash/linux-image-6.8.0-78-generic.0.uploaded
   640:0:124:2389264:2025-08-28 09:14:38.577099561 +0100:2025-08-31 09:29:43.950523499 +0100:/var/crash/linux-image-6.8.0-78-generic.0.crash
   600:0:124:158713:2025-08-30 06:40:26.674438835 +0100:2025-08-31 09:27:44.148351577 +0100:/var/crash/linux-image-6.8.0-79-generic.0.crash
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Aug 31 09:38:09 2025
  InstallationDate: Installed on 2025-05-17 (105 days ago)
  InstallationMedia:
   
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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