installed linux-image-4.15.0-124-generic package post-removal script subprocess returned error exit status 1

The error message I received for this problem invited me to submit a bug report.

(1) PROBLEM: I upgraded from Ubuntu 18.04 to 20.04 on 12 Dec. 2020. I first made sure the 18.04 system was properly updated.

(2) METHOD OF UPGRADE: I upgraded using the standard "Software Updater", hence I had no opportunity to make a mistake.

(3) ERROR MESSAGE: The process went smoothly until the very end before "restart", when the following message appeared in a box:

"The upgrade will continue but the 'linux-image-4.15.0-124-generic'
package may not be in a working state. Please consider submitting a bug
report about it.

installed linux-image-4.15.0-124-generic package post-removal script
subprocess returned error exit status 1"

(4) CURRENT KERNEL: "uname -r" indicates that the current kernel is "5.4.0-58-generic". So "4.15.0-124-generic" apparently did NOT install.

CURRENT MALFUNCTIONS

(1) The main problem so far is that updates are not possible. Using the "Software Updater", I receive an "Not all updates can be installed" box. A "partial upgrade" says "removing linux-image-4.15.0-124" and then gives me the same message as above: "The upgrade will continue ...". Finally:

"Could not install the uprades. The upgrade has aborted. Your system could be in an unusable state. A recovery will run now (dpkg-configure -a)".

Then:

"Upgrade complete. The upgrade has completed but there were errors during the upgrade process."

(2) The system does not awaken from sleep properly. It shows only a dark blue screen or complete multicoloured snow with vertical lines or various patterns. No login screen. I have to reboot with "Alt. PrintScr. REISUB"

NORMAL FUNCTIONS SO FAR
There is an internet connection, email works,browsers work and the Gnome screen shows up normally.

ATTEMPTED REMEDY

~$ sudo apt-get install -f

Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED
  linux-image-4.15.0-124-generic
0 to upgrade, 0 to newly install, 1 to remove and 0 not to upgrade.
1 not fully installed or removed.
After this operation, 8,415 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 242464 files and directories currently installed.)
Removing linux-image-4.15.0-124-generic (4.15.0-124.127) ...
/etc/kernel/postrm.d/initramfs-tools:
update-initramfs: Deleting /boot/initrd.img-4.15.0-124-generic
/etc/kernel/postrm.d/zz-update-grub:
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.4.0-58-generic
Found initrd image: /boot/initrd.img-5.4.0-58-generic
Found linux image: /boot/vmlinuz-4.15.0-128-generic
Found initrd image: /boot/initrd.img-4.15.0-128-generic
/etc/grub.d/bin/grubcfg_proxy: error while loading shared libraries: libcrypto.so.1.0.0: cannot open shared object file: No such file or directory
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 127
dpkg: error processing package linux-image-4.15.0-124-generic (--remove):
 installed linux-image-4.15.0-124-generic package post-removal script subprocess returned error exit status 1
dpkg: too many errors, stopping
Errors were encountered while processing:
 linux-image-4.15.0-124-generic
Processing was halted because there were too many errors.
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.29
ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 13 12:37:58 2020
InstallationDate: Installed on 2016-01-02 (1806 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeAptHistorylog:
 Start-Date: 2020-12-12 21:40:20
 Requested-By: john (1000)
 Remove: linux-image-4.15.0-124-generic:amd64 (4.15.0-124.127)
 Error: Sub-process /usr/bin/dpkg returned an error code (1)
 End-Date: 2020-12-12 21:40:25
VarLogDistupgradeTermlog: