Sadly I can reproduce this.  It hangs claiming "Checking package
manager".  From the (attached) strace output, there is a rather
desperate effort made to find a non-existent translations file all over
the various sources followed by the hang.  The last line in main.log is

  2008-04-24 05:09:06,836 DEBUG running doUpdate() (showErrors=False)

In my case I am using a squid proxy server (configured in
/etc/apt/apt.conf).  Based on previous work I did writing a proxy for
apt for use in a development/build environment, apt is exceedingly flaky
when connections don't go exactly its way.  For example if a
mirror/proxy closes a connection when apt doesn't want it closed then
apt will return an error or hang, even though it is perfectly valid
http. Completely wiping the squid cache didn't fix things nor did
disabling the use of a proxy.

An install on another machine a few hours ago went just fine even though
it was using exactly the same proxy.

** Attachment added: "Update manager hanging when using a proxy server"
   http://launchpadlibrarian.net/13851969/umhang

-- 
"distribution upgrade" hangs during update to hardy
https://bugs.launchpad.net/bugs/186465
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