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After installing the Ubuntu xen-server packages and rebooting the operating system using the Xen kernel the boot process appears to hang after displaying the "Setting system clock..." message.
This is a problem related to the ''hwclock '' binary which is common to a number of different Linux distributions in addition to Ubuntu. This problem can occur both when booting the host Xen system and when launching guest (domainU) systems.
<pre>
sudo suupdate-rc.d -f hwclock.sh removesudo update-rc.d -f hwclockfirst.sh remove
</pre>
<pre>
</pre>
Once one of these sets of changes has been made to both the hwclockfirst.sh and hwclock.sh, files simply reboot unmount the system domainU root filesystem and the guest Ubuntu system should boot fully without hanging. [[Category:Virtualization Problem Solutions]]