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I am trying this guide: https://help.ubuntu.com/lts/serverguide/cloud-images-and-uvtool.html

$ uvt-simplestreams-libvirt sync release=trusty arch=amd64
bogdanbiv@bivub1404:~$ time uvt-kvm create secondtest release=trusty

real    0m0.673s
user    0m0.127s
sys     0m0.050s

# although last command takes less than 1 second the next command proves 
# the former actually performed something
bogdanbiv@bivub1404:~$ uvt-kvm create secondtest release=trusty 
uvt-kvm: error: libvirt: storage volume 'secondtest.qcow' exists already

bogdanbiv@bivub1404:~$ uvt-kvm wait secondttest --insecure
uvt-kvm: error: libvirt: Domain not found: no domain with matching name 'secondttest'

So what's wrong here? These are exact commands from the Ubuntu documentation - I don't see any difference so I assume something's up.

I had generated a RSA key before creating my VMs.

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Firstly, timing a command via time doesn't mean that its effects are undone after the command. So

time uvt-kvm create secondtest release=trusty

creates secondtest, and then you try to create it again:

uvt-kvm create secondtest release=trusty

which obviously fails, since the domain (and its associated image) already exists.

In the third command, you made a typo: secondttest instead of secondtest. So it should be:

uvt-kvm wait secondtest --insecure

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