Not sure what caused this, but I just tried to update a VMware running Debian Etch, and now it's haning on:
chmod 644 /root/ispconfig/openssl/lib/pkgconfig/libcrypto.pc
The update was from ISPconfig 2.2.27, and till now I've never had any problems updating this VMware server.
UPDATE. I lost the screen connection, and this was the problem
As soon as I reconnected to the screen (screen -R) the install was still going on as it should.