Verified 1.10ubuntu5.1 on Disco.

The crash was already fixed, but u-u did not recognize the moved conffile as the same:


root@dd-lp-1823872:~# dpkg -l qemu-guest-agent unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version             Architecture Description
+++-===================-===================-============-===========================================
ii  qemu-guest-agent    1:3.1+dfsg-2ubuntu2 amd64        Guest-side qemu-system agent
ii  unattended-upgrades 1.10ubuntu5         all          automatic installation of security upgrades
root@dd-lp-1823872:~# unattended-upgrade --dry-run --verbose --debug
...
fetch.run() result: 0
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 FileSize: 202440 DestFile:'/var/cache/apt/archives/qemu-guest-agent_1%3a3.1+dfsg-2ubuntu3_amd64.deb' DescURI: 'http://archive.ubuntu.com/ubuntu/pool/universe/q/qemu/qemu-guest-agent_3.1+dfsg-2ubuntu3_amd64.deb' ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/qemu-guest-agent_1%3a3.1+dfsg-2ubuntu3_amd64.deb)
found pkg: qemu-guest-agent
conffile line: /etc/init.d/qemu-guest-agent f61a64ac1e48993023018fd1cff85191
current md5: f61a64ac1e48993023018fd1cff85191
conffile line: /etc/qemu/fsfreeze-hook/fsfreeze-hook 15f6ff42cbc5550a07ee21c2a471d905
/etc/qemu/fsfreeze-hook/fsfreeze-hook not in package conffiles /etc/init.d/qemu-guest-agent
/etc/qemu/fsfreeze-hook
found conffile /etc/qemu/fsfreeze-hook in new pkg but on dpkg status
blacklist: []
...

Fixed u-u recognize them being the same:
root@dd-lp-1823872:~# dpkg -l qemu-guest-agent unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                Version             Architecture Description
+++-===================-===================-============-===========================================
ii  qemu-guest-agent    1:3.1+dfsg-2ubuntu2 amd64        Guest-side qemu-system agent
ii  unattended-upgrades 1.10ubuntu5.1       all          automatic installation of security upgrades
root@dd-lp-1823872:~# unattended-upgrade --dry-run --verbose --debug
...                                                                                                                                               
fetch.run() result: 0
<apt_pkg.AcquireItem object:Status: 2 Complete: 1 Local: 1 IsTrusted: 1 FileSize: 202440 DestFile:'/var/cache/apt/archives/qemu-guest-agent_1%3a3.1+dfsg-2ubuntu3_amd64.deb' DescURI: 'http://archive.ubuntu.com/ubuntu/pool/universe/q/qemu/qemu-guest-agent_3.1+dfsg-2ubuntu3_amd64.deb' ID:0 ErrorText: ''>
check_conffile_prompt(/var/cache/apt/archives/qemu-guest-agent_1%3a3.1+dfsg-2ubuntu3_amd64.deb)
found pkg: qemu-guest-agent
conffile line: /etc/init.d/qemu-guest-agent f61a64ac1e48993023018fd1cff85191
current md5: f61a64ac1e48993023018fd1cff85191
conffile line: /etc/qemu/fsfreeze-hook/fsfreeze-hook 15f6ff42cbc5550a07ee21c2a471d905
current md5: 15f6ff42cbc5550a07ee21c2a471d905
blacklist: []
...