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
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