VBox VM loses network - workaround for Fedora

vbox-restart-vm-network-after-sleep.txt

# if your VM went to sleep / hibernate, and on wakeup can't find the network...

# switch your guest's Network settings in Virtual Box as follows:

  Attached to: Bridged Adapter
  Name: Intel Wifi
  Promiscuous Mode: Allow VMs
  [x] Cable Connected

# go back into the VM and run 

  sudo su
  systemctl restart systemd-resolved.service
  echo "nameserver 8.8.8.8" >> /etc/resolv.conf 
  echo "nameserver 8.8.4.4" >> /etc/resolv.conf
  exit

# ping and chrome should work again

# thanks to https://www.virtualbox.org/ticket/19358 for the solution!