Proxmox KVM virtual machine: Cannot delete due to missing storage

Today we encountered a situation where a Proxmox system’s KVM virtual machine refused to delete after the storage volume that it’s virtual HDD resided on was lost; trying to delete the KVM from the web GUI resulted in the following error:  
TASK ERROR: storage ‘proxmoxHDD’ does not exists
  Attempting to delete it from the command line using:  
qm destroy [VM ID]
  …resulted in:  
storage ‘proxmoxHDD’ does not exists
  Fortunately, there’s a way around this. The KVM config files live in:  
  Move or erase the [VM ID].conf file and when you refresh your web GUI the VM should be gone.

Ubuntu: How to delete a user

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  In Ubuntu 12.04 and 12.10, to delete an additional user you have created, use the following:  
sudo deluser [username]
  By example, if we wanted to delete a user we created called “test”, we would run:  
sudo deluser test
  Which gives:  
Removing user `test’ … Warning: group `test’ has no more members. Done.
  Be careful with this – don’t delete your admin account ūüôā

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  If you have upgraded your kernel you will have found that Ubuntu keeps the older ones around, which can be handy if something breaks in the newer kernel and you have to boot from your old system. Over time, however, these can add up in terms of the amount of space consumed – at around 150MB per kernel you could easily find yourself with over a GB of old kernels if you’ve upgraded enough times. In this example the system we are using is Ubuntu If you’re using Ubuntu Desktop, open up a terminal window – if you’re using Ubuntu Server, log in as usual and run:  
uname -r
to see which kernel you are currently running. Make sure not to delete this one. Now, to see a list of the installed kernels, we run:  
dpkg –list | grep linux-image
This command lists the installed packages and filters the list to include only those which have “linux-image” in them, which should only be your kernels. Your list should look something along the lines of:  
ii  linux-image-2.6.32-33-server 2.6.32-33.72     Linux kernel image for version 2.6.32 on x86_64 ii  linux-image-3.2.0-35-generic 3.2.0-35.55      Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii  linux-image-3.2.0-38-generic 3.2.0-38.61      Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii  linux-image-server       Linux kernel image on Server Equipment.
  To remove a kernel, run the following:  
sudo apt-get purge [kernel]
  Using the above list, say we want to get rid of 3.2.0-35. In that case the command would be:  
sudo apt-get purge linux-image-3.2.0-35-generic  
Once you have removed your unwanted kernels run:  
sudo update-grub2
  This will update the boot menu accordingly.