package clamav-daemon 0.99.4+addedllvm-0ubuntu0.16.04.1 [modified: lib/systemd/system/clamav-daemon.socket] failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Like it says. clamav won't uninstall to install a new version.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: clamav-daemon 0.99.4+addedllvm-0ubuntu0.16.04.1 [modified: lib/systemd/system/clamav-daemon.socket]
ProcVersionSignature: Ubuntu 4.4.0-122.146-generic 4.4.117
Uname: Linux 4.4.0-122-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Tue Jul 17 14:51:04 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-12-21 (1669 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-122-generic root=UUID=0078e605-de20-44d0-b37e-4e8dfa0e925e ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.27
SourcePackage: clamav
Title: package clamav-daemon 0.99.4+addedllvm-0ubuntu0.16.04.1 [modified: lib/systemd/system/clamav-daemon.socket] failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-10-04 (650 days ago)