I tried running this again after installing apport with the following
result:

do-release-upgrade


Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,248 kB]
Fetched 1,248 kB in 0s (0 B/s)
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://mirrors.linode.com/ubuntu xenial InRelease
Hit http://mirrors.linode.com/ubuntu xenial-updates InRelease
Hit http://mirrors.linode.com/ubuntu xenial-backports InRelease
Hit http://archive.ubuntu.com/ubuntu xenial InRelease
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Fetched 109 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Updating repository information

Third party sources disabled

Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.

To continue please press [ENTER]

Get:1 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:3 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 
[1,527 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [8,570 kB]
Get:5 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages [906 
kB]
Get:6 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en 
[296 kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 
Packages [224 kB]
Get:8 http://security.ubuntu.com/ubuntu bionic-security/restricted i386 
Packages [13.5 kB]
Get:9 http://security.ubuntu.com/ubuntu bionic-security/restricted 
Translation-en [29.6 kB]
Get:10 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 
Packages [1,102 kB]
Get:11 http://security.ubuntu.com/ubuntu bionic-security/universe i386 Packages 
[973 kB]
Get:12 http://security.ubuntu.com/ubuntu bionic-security/universe 
Translation-en [247 kB]
Get:13 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 
Packages [26.0 kB]
Get:14 http://security.ubuntu.com/ubuntu bionic-security/multiverse i386 
Packages [9,208 B]
Get:15 http://security.ubuntu.com/ubuntu bionic-security/multiverse 
Translation-en [5,272 B]
Get:16 http://archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8,531 kB]
Get:17 http://archive.ubuntu.com/ubuntu bionic/universe Translation-en [4,941 
kB]
Fetched 27.7 MB in 6s (4,610 kB/s)

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

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 259, in __getitem__
    return self._weakref[key]
  File "/usr/lib/python3.5/weakref.py", line 131, in __getitem__
    o = self.data[key]()
KeyError: 'ubuntu-minimal'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 263, in __getitem__
    rawpkg = self._cache[key]
KeyError: 'ubuntu-minimal'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-r4jvpf1p/bionic", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeMain.py", 
line 238, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeController.py", 
line 2072, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeController.py", 
line 1955, in fullUpgrade
    if not self.cache.anyVersionDownloadable(self.cache[pkg]):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 265, in __getitem__
    raise KeyError('The cache has no package named %r' % key)
KeyError: "The cache has no package named 'ubuntu-minimal'"
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/problem_report.py", line 497, in 
add_to_existing
    self.write(f)
  File "/usr/lib/python3/dist-packages/problem_report.py", line 450, in write
    block = f.read(1048576)
  File "/usr/lib/python3.5/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid 
start byte

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 259, in __getitem__
    return self._weakref[key]
  File "/usr/lib/python3.5/weakref.py", line 131, in __getitem__
    o = self.data[key]()
KeyError: 'ubuntu-minimal'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 263, in __getitem__
    rawpkg = self._cache[key]
KeyError: 'ubuntu-minimal'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-r4jvpf1p/bionic", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeMain.py", 
line 238, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeController.py", 
line 2072, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-r4jvpf1p/DistUpgrade/DistUpgradeController.py", 
line 1955, in fullUpgrade
    if not self.cache.anyVersionDownloadable(self.cache[pkg]):
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 265, in __getitem__
    raise KeyError('The cache has no package named %r' % key)
KeyError: "The cache has no package named 'ubuntu-minimal'"

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https://bugs.launchpad.net/bugs/1913786

Title:
  fatal error occurred during upgrade  to 18.04.5

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