Hi,
I’m making re-lecture of previous chapters, trying to rerun some vagrant VM given in the handouts.
So I decided to create new directories (~/university/m312/m312-vagrant-env-chp[1-4] )and unzip inside the archive “m312-vagrant-env.zip” given in every chapter.
Then I realized that I cannot have several instance of the same “m312” vagrant VM, so I did this :
vagrant destroy m312
Then I tried a “vagrant up” command line, but here is the error message I got :
ThinkPad-T420:~/university/m312/m312-vagrant-env_chp3$ vagrant up
Bringing machine ‘m312’ up with ‘virtualbox’ provider…
==> m312: Importing base box ‘ubuntu/trusty64’…
==> m312: Matching MAC address for NAT networking…
A VirtualBox machine with the name ‘m312’ already exists.
Please use another name or delete the machine with the existing
name, and try again.
Any idea how to reinstall a box m312 ? I’m actually stuck… 
Thanks,
Patrick