Same here with esxi 5.1 with virtual and server kernel on guest ubuntu 12.04.1 3.2.0-36 x86_64 I solved (think solved from 40 minutes there is no stucks) vmware tools installed version: ~$ grep buildNr /usr/bin/vmware-config-tools.pl my $buildNr; $buildNr = '9.0.0 build-782409'; return remove_whitespaces($buildNr); Justh on vsphere settings edit the cpu configuration. First was 1 socket with 2 CPU's, now (mean this solve the problem) 2 sockets with 1 CPU per socket. Hardware where host esxi 5.1 installed is HP Proliant ML350 G5 with 5 GB RAM with just one CPU Intel(R) Xeon(R) CPU 5130 @ 2.00GHz
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