Security Update 2013-001 Server (Lion)

Hey,

last night I tried to install the latest Security Update on our server, which did not complete.

It is stuck; see the screenshot.

Below ist the excerpt of /var/log/install.log

Mar 25 19:33:45 leo installd[44255]: PackageKit: ----- Begin install -----
Mar 25 19:33:45 leo installd[44255]: PackageKit: request=PKInstallRequest <2 packages, destination=/>
Mar 25 19:33:46 leo installd[44255]: PackageKit: packages=(
        "PKLeopardPackage <file://localhost/Library/Updates/zzz041-9755/SecUpdSrvr2013-001.pkg>",
        "PKLeopardPackage <file://localhost/Library/Updates/zzz041-9755/SecUpd2013-001.pkg>"
    )
Mar 25 19:33:46 leo installd[44255]: PackageKit: Extracting file://localhost/Library/Updates/zzz041-9755/SecUpdSrvr2013-001.pkg (destination=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root, uid=0)
Mar 25 19:33:48 leo installd[44255]: PackageKit: Extracting file://localhost/Library/Updates/zzz041-9755/SecUpd2013-001.pkg (destination=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root, uid=0)
Mar 25 19:33:50 leo installd[44255]: PackageKit: update_dyld_shared_cache -overlay /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root
Mar 25 19:33:51 leo installd[44255]: update_dyld_shared_cache[44272] updating i386 cache because dylib at /usr/lib/system/libsystem_sandbox.dylib has changed
Mar 25 19:33:58 leo installd[44255]: update_dyld_shared_cache[44272] updating x86_64 cache because dylib at /usr/lib/system/libsystem_sandbox.dylib has changed
Mar 25 19:34:05 leo installd[44255]: PackageKit: xpchelper --rebuild-cache --overlay /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root
Mar 25 19:34:05 leo installd[44255]: PackageKit: Executing script "preinstall" in /private/tmp/PKInstallSandbox.KUlGfj/Scripts/com.apple.pkg.update.security.10.7.5.11G1018.2013.001.zULhs5
Mar 25 19:34:05 leo _cvmsroot[44283]: Running Install Scripts . . .
Mar 25 19:34:05 leo _cvmsroot[44285]: 0 Install Scripts run.
Mar 25 19:34:05 leo installd[44255]: PackageKit: Shoving /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/Cleanup At Startup/PKInstallSandbox-tmp/Root (6 items) to /
Mar 25 19:34:05 leo installd[44255]: PackageKit: Moved active dyld cache file dyld_shared_cache_x86_64 to /var/run
Mar 25 19:34:05 leo installd[44255]: PackageKit: Moved active dyld cache file dyld_shared_cache_x86_64.map to /var/run
Mar 25 19:34:06 leo installd[44255]: PackageKit: kextcache -system-caches
Mar 25 19:34:09 leo installd[44255]: PackageKit: kextcache -update-volume / -Installer
Mar 25 19:34:09 leo installd[44255]: kextcache: JMicronATA.kext does not declare a kernel dependency; using com.apple.kernel.6.0.
Mar 25 19:34:43: --- last message repeated 2 times ---
Mar 25 19:34:43 leo installd[44255]: PackageKit: Executing script "postinstall" in /private/tmp/PKInstallSandbox.KUlGfj/Scripts/com.apple.pkg.update.security.10.7.5.11G1018.2013.001.zULhs5
Mar 25 19:34:43 leo _cvmsroot[44322]: Running Install Scripts . . .
Mar 25 19:34:43 leo _cvmsroot[44324]: Begin script: cleanFiles
Mar 25 19:34:43 leo installd[44255]: postinstall: Reading ./Tools/cleanList for cleaning
Mar 25 19:34:43 leo _cvmsroot[44331]: End script: cleanFiles
Mar 25 19:34:43 leo _cvmsroot[44332]: Begin script: mod_hfs_apple
Mar 25 19:34:43 leo _cvmsroot[44334]: End script: mod_hfs_apple
Mar 25 19:34:43 leo _cvmsroot[44335]: Begin script: mrt
Mar 25 19:34:44 leo installd[44255]: postinstall: id: : no such user
Mar 25 19:34:44: --- last message repeated 1 time ---
Mar 25 19:34:44 leo installd[44255]: postinstall: Couldn't spawn command: load

I have no idea what is wrong with the script "postinstall".

Can anyone please help? Is ist safe to kill the update process and try the update again?

Mac Pro, 10.7.5 Server.

Thanks a lot,

Philipp