Public bug reported:

After a recent Ubuntu 20.04 update, (between Oct 1 and Oct 7, I have
been unable to dual boot to Ubuntu 18.10. Ubuntu 20.04 still boots. This
happens on TWO different computer I have. The reason I run 18.10 is
because bug: "hfs+ filesystems fail reading / writing large files" has
yet to be fixed. Once a week I backup my system to a HFS+ formatted USB
Flash drive. I need this to transfer files to my Mac Mini.

The exact error is: Bad Signature /boot/vmlinix-4.18.0-25generic you
will need to reload the kernel first.

I tried booting in the safe mode. Same error.
I tried booting version vmlinix-4.18.0-24generic, same error.

Obviously, my 18.10 kernel CAN'T have changed, as it is well beyond being 
updated.
Thus, I suspect that some signature file was updated WITHOUT some older 
signatures.

Description:    Ubuntu 20.04.1 LTS
Release:        20.04

I expected to boot to Ubuntu 18.10

What happened: I was returned to the grub menu

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-48-generic 5.4.0-48.52
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  uschcld    1407 F.... pulseaudio
 /dev/snd/pcmC0D0p:   uschcld    1407 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Thu Oct  8 14:33:21 2020
InstallationDate: Installed on 2020-05-17 (143 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Acer Aspire E5-576
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic 
root=UUID=75021464-0e3f-4ad2-a466-cf655a6c4dd7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-48-generic N/A
 linux-backports-modules-5.4.0-48-generic  N/A
 linux-firmware                            1.187.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/06/2018
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.47
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Ironman_SK
dmi.board.vendor: KBL
dmi.board.version: V1.47
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.47:bd09/06/2018:svnAcer:pnAspireE5-576:pvrV1.47:rvnKBL:rnIronman_SK:rvrV1.47:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.family: Aspire E 15
dmi.product.name: Aspire E5-576
dmi.product.sku: 0000000000000000
dmi.product.version: V1.47
dmi.sys.vendor: Acer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

  After a recent Ubuntu 20.04 update, (between Oct 1 and Oct 7, I have
  been unable to dual boot to Ubuntu 18.10. Ubuntu 20.04 still boots. This
  happens on TWO different computer I have. The reason I run 18.10 is
  because bug: "hfs+ filesystems fail reading / writing large files" has
  yet to be fixed. Once a week I backup my system to a HFS+ formatted USB
  Flash drive. I need this to transfer files to my Mac Mini.
  
  The exact error is: Bad Signature /boot/vmlinix-4.18.0-25generic you
  will need to reload the kernel first.
  
  I tried booting in the safe mode. Same error.
  I tried booting version vmlinix-4.18.0-24generic, same error.
  
  Obviously, my 18.10 kernel CAN'T have changed, as it is well beyond being 
updated.
  Thus, I suspect that some signature file was updated WITHOUT some older 
signatures.
  
  Description:  Ubuntu 20.04.1 LTS
  Release:      20.04
  
  I expected to boot to Ubuntu 18.10
  
  What happened: I was returned to the grub menu
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-48-generic 5.4.0-48.52
  ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  uschcld    1407 F.... pulseaudio
-  /dev/snd/pcmC0D0p:   uschcld    1407 F...m pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  uschcld    1407 F.... pulseaudio
+  /dev/snd/pcmC0D0p:   uschcld    1407 F...m pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Thu Oct  8 14:33:21 2020
  InstallationDate: Installed on 2020-05-17 (143 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Acer Aspire E5-576
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic 
root=UUID=75021464-0e3f-4ad2-a466-cf655a6c4dd7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-5.4.0-48-generic N/A
-  linux-backports-modules-5.4.0-48-generic  N/A
-  linux-firmware                            1.187.3
+  linux-restricted-modules-5.4.0-48-generic N/A
+  linux-backports-modules-5.4.0-48-generic  N/A
+  linux-firmware                            1.187.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/06/2018
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.47
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Ironman_SK
  dmi.board.vendor: KBL
  dmi.board.version: V1.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.47:bd09/06/2018:svnAcer:pnAspireE5-576:pvrV1.47:rvnKBL:rnIronman_SK:rvrV1.47:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.family: Aspire E 15
  dmi.product.name: Aspire E5-576
  dmi.product.sku: 0000000000000000
  dmi.product.version: V1.47
  dmi.sys.vendor: Acer

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https://bugs.launchpad.net/bugs/1899066

Title:
  Dual boot Ubuntu 18.10 fails after Ubuntu 20.04 update - Bad Signature

Status in linux package in Ubuntu:
  New

Bug description:
  After a recent Ubuntu 20.04 update, (between Oct 1 and Oct 7, I have
  been unable to dual boot to Ubuntu 18.10. Ubuntu 20.04 still boots.
  This happens on TWO different computer I have. The reason I run 18.10
  is because bug: "hfs+ filesystems fail reading / writing large files"
  has yet to be fixed. Once a week I backup my system to a HFS+
  formatted USB Flash drive. I need this to transfer files to my Mac
  Mini.

  The exact error is: Bad Signature /boot/vmlinix-4.18.0-25generic you
  will need to reload the kernel first.

  I tried booting in the safe mode. Same error.
  I tried booting version vmlinix-4.18.0-24generic, same error.

  Obviously, my 18.10 kernel CAN'T have changed, as it is well beyond being 
updated.
  Thus, I suspect that some signature file was updated WITHOUT some older 
signatures.

  Description:  Ubuntu 20.04.1 LTS
  Release:      20.04

  I expected to boot to Ubuntu 18.10

  What happened: I was returned to the grub menu

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-48-generic 5.4.0-48.52
  ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  uschcld    1407 F.... pulseaudio
   /dev/snd/pcmC0D0p:   uschcld    1407 F...m pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Thu Oct  8 14:33:21 2020
  InstallationDate: Installed on 2020-05-17 (143 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Acer Aspire E5-576
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-48-generic 
root=UUID=75021464-0e3f-4ad2-a466-cf655a6c4dd7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-48-generic N/A
   linux-backports-modules-5.4.0-48-generic  N/A
   linux-firmware                            1.187.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/06/2018
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.47
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Ironman_SK
  dmi.board.vendor: KBL
  dmi.board.version: V1.47
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.47:bd09/06/2018:svnAcer:pnAspireE5-576:pvrV1.47:rvnKBL:rnIronman_SK:rvrV1.47:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.family: Aspire E 15
  dmi.product.name: Aspire E5-576
  dmi.product.sku: 0000000000000000
  dmi.product.version: V1.47
  dmi.sys.vendor: Acer

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