Ubuntu Guide posted a tip about fixing the "cannot connect to wired Internet" problem in Ubuntu or Ubuntu vmware guest

The wired internet connection by default is configured properly in Ubuntu installation. We can directly dial-up via sudo pppoeconf, or connect to a cable which already on internet. But sometimes wired connection stop working because of kernel upgraded, installed a special program, or even something to do with wireless.

  Fix cannot connect to wired Internet problem in Ubuntu or Ubuntu vmware guest