Ubuntu でセキュリティアップグレードのみを実行するため、下記のコマンドを実行した結果、エラーとなりました。
この原因と解決策を教えていただけないでしょうか。よろしくお願いいたします。

・環境
Ubuntu 20.04.3 LTS

・コマンド実行結果
# unattended-upgrade --dry-run
Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1705, in try_to_upgrade
    cache.mark_upgrade_adjusted(pkg, from_user=not pkg.is_auto_installed)
  File "/usr/bin/unattended-upgrade", line 440, in mark_upgrade_adjusted
    self.call_adjusted(apt.package.Package.mark_upgrade, pkg, **kwargs)
  File "/usr/bin/unattended-upgrade", line 399, in call_adjusted
    self.clear()
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 700, in clear
    self._depcache.init()
apt_pkg.Error: E:The package base-files needs to be reinstalled, but I can't find an archive for it.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 2514, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1985, in main
    res = run(options, rootdir, mem_log, logfile_dpkg,
  File "/usr/bin/unattended-upgrade", line 2157, in run
    pkgs_to_upgrade = calculate_upgradable_pkgs(cache, options)
  File "/usr/bin/unattended-upgrade", line 1746, in calculate_upgradable_pkgs
    try_to_upgrade(pkg,
  File "/usr/bin/unattended-upgrade", line 1716, in try_to_upgrade
    rewind_cache(cache, pkgs_to_upgrade)
  File "/usr/bin/unattended-upgrade", line 1334, in rewind_cache
    cache.clear()
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 700, in clear
    self._depcache.init()
apt_pkg.Error: E:The package base-files needs to be reinstalled, but I can't find an archive for it.