Entry-level Ubuntu user, please bear with me. Using Ubuntu's Update Manager, one of the updates stopped because it could not find the directory /var/log/clamav when it was trying to touch/create a logfile because my install of clamav from the Ubuntu Software Center either did not create one or the system flushes out the /var/log directory upon logout.
In either case, the updater could not find the directory to create the file in and did not autocreate directory. I will manually create said directory and try the update again.
ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: clamav-daemon 0.97.3+dfsg-1ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.38-15.59-generic 2.6.38.8
Uname: Linux 2.6.38-15-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sat May 19 13:36:14 2012
ErrorMessage: subprocess installed post-installation script returned error exit status 1
SourcePackage: clamav
Title: package clamav-daemon 0.97.3+dfsg-1ubuntu0.11.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
Confirmed and reproduced, postinst packages don't have /var/log/clamav creation and it's not created by the package postinst or available in the dirs file