Comment 6 for bug 1795696

Luckily I found an older machine I didn't fix manually today :)

[...]
check_conffile_prompt(/var/cache/apt/archives/gnupg2_2.2.4-1ubuntu1.2_all.deb)
found pkg: gnupg2
No conffiles in deb /var/cache/apt/archives/gnupg2_2.2.4-1ubuntu1.2_all.deb (There is no member named 'conffiles')
blacklist: []
whitelist: []
Removing unused kernel packages: linux-modules-4.15.0-36-generic linux-image-4.15.0-36-generic linux-headers-4.15.0-36-generic linux-modules-extra-4.15.0-36-generic linux-headers-4.15.0-36
Keeping 5 auto-removable package(s) because it would also remove the following packages which should be kept in this step: apt apt-transport-https apt-utils avahi-autoipd avahi-daemon avahi-utils bind9-host chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg cups cups-bsd cups-client cups-common cups-core-drivers cups-daemon cups-ipp-utils cups-ppdc cups-server-common dnsutils file firefox firefox-locale-en gdm3 ghostscript ghostscript-x gir1.2-gdm-1.0 gir1.2-gnomebluetooth-1.0 gir1.2-gnomedesktop-3.0 gir1.2-javascriptcoregtk-4.0 gir1.2-polkit-1.0 gir1.2-webkit2-4.0 gnome-bluetooth gnome-desktop3-data gnupg-agent gnupg2 gvfs gvfs-backends gvfs-bin gvfs-common gvfs-daemons gvfs-fuse gvfs-libs initramfs-tools initramfs-tools-bin initramfs-tools-core krb5-locales libapt-inst2.0 libapt-pkg5.0 libarchive13 libavahi-client3 libavahi-common-data libavahi-common3 libavahi-core7 libavahi-glib1 libavahi-ui-gtk3-0 libbind9-160 libcaca0 libconfuse-common libconfuse2 libcups2 libcupscgi1 libcupsimage2 libcupsmime1 libcupsppdc1 libcurl3-gnutls libdns-export1100 libdns1100 libexiv2-14 libfreerdp-client2-2 libfreerdp2-2 libgd3 libgdm1 libgnome-bluetooth13 libgnome-desktop-3-17 libgs9 libgs9-common libgssapi-krb5-2 libirs160 libisc-export169 libisc169 libisccc160 libisccfg160 libjavascriptcoregtk-4.0-18 libk5crypto3 libkrb5-3 libkrb5support0 libldb1 liblwres160 libmagic-mgc libmagic1 libnss-myhostname libnss-systemd libnss3 libpam-systemd libpolkit-agent-1-0 libpolkit-backend-1-0 libpolkit-gobject-1-0 libpoppler-glib8 libpoppler73 libraw16 libssl1.0.0 libssl1.1 libsystemd0 libtiff5 libu2f-udev libudev1 libvncclient1 libwavpack1 libwebkit2gtk-4.0-37 libwebkit2gtk-4.0-37-gtk2 libwinpr2-2 libzmq5 linux-firmware linux-generic linux-generic-hwe-16.04 linux-headers-4.15.0-46 linux-headers-4.15.0-46-generic linux-headers-generic linux-image-4.15.0-46-generic linux-image-generic linux-libc-dev linux-modules-4.15.0-46-generic linux-modules-extra-4.15.0-46-generic nplan openjdk-8-jdk openjdk-8-jdk-headless openjdk-8-jre openjdk-8-jre-headless openssl policykit-1 poppler-utils python-ldb python3-lxml snapd systemd systemd-sysv thunderbird thunderbird-gnome-support thunderbird-locale-en thunderbird-locale-en-us tzdata ubuntu-core-launcher udev
Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1998, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1798, in main
    options.verbose or options.debug, options.dry_run)
  File "/usr/bin/unattended-upgrade", line 1495, in do_auto_remove
    if res:
UnboundLocalError: local variable 'res' referenced before assignment
Error in atexit._run_exitfuncs:
FileNotFoundError: [Errno 2] No such file or directory: '/var/run/unattended-upgrades.pid'

Does that help already?