[Bug 1901395] [NEW] Not enough free disk space for /boot while upgrading from 20.04 LTS to 20.10

[Norbert]

Public bug reported:

Initially I have a 14.04 LTS system with encrypted LVM default partitioning.
It was successfully upgraded to 16.04 LTS, then to 18.04 LTS and then to 20.04 LTS by using simple do-release-upgrade command.

Now it can't upgrade from 20.04 LTS to 20.10. It complains about the
disk space:

```
Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Calculating the changes

Calculating the changes

Not enough free disk space

The upgrade has aborted. The upgrade needs a total of 206 M free 
space on disk '/boot'. Please free at least an additional 89,1 M of 
disk space on '/boot'. You can remove old kernels using 'sudo apt 
autoremove' and you could also set COMPRESS=xz in 
/etc/initramfs-tools/initramfs.conf to reduce the size of your 
initramfs. 


Restoring original system state

Aborting

```

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.28
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sun Oct 25 13:27:21 2020
InstallationDate: Installed on 2020-10-24 (0 days ago)
InstallationMedia: Ubuntu MATE 14.04.2 "Trusty Tahr" - LTS amd64 (20150323)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2020-10-25 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-10-25T13:10:11.116833

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal groovy

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https://bugs.launchpad.net/bugs/1901395

Title:
  Not enough free disk space for /boot while upgrading from 20.04 LTS to
  20.10

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Initially I have a 14.04 LTS system with encrypted LVM default partitioning.
  It was successfully upgraded to 16.04 LTS, then to 18.04 LTS and then to 20.04 LTS by using simple do-release-upgrade command.

  Now it can't upgrade from 20.04 LTS to 20.10. It complains about the
  disk space:

  ```
  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Not enough free disk space

  The upgrade has aborted. The upgrade needs a total of 206 M free 
  space on disk '/boot'. Please free at least an additional 89,1 M of 
  disk space on '/boot'. You can remove old kernels using 'sudo apt 
  autoremove' and you could also set COMPRESS=xz in 
  /etc/initramfs-tools/initramfs.conf to reduce the size of your 
  initramfs. 

  
  Restoring original system state

  Aborting

  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.28
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Sun Oct 25 13:27:21 2020
  InstallationDate: Installed on 2020-10-24 (0 days ago)
  InstallationMedia: Ubuntu MATE 14.04.2 "Trusty Tahr" - LTS amd64 (20150323)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2020-10-25 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-10-25T13:10:11.116833

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