Outdated ISO download URL

[dovry]

The URL to the .iso is outdated - something along the lines of this
should be implemented [see lines 68-78]

#get the latest versions of Ubuntu LTS

tmphtml=$tmp/tmphtml
rm $tmphtml >/dev/null 2>&1
wget -O $tmphtml 'http://releases.ubuntu.com/' >/dev/null 2>&1

prec=$(fgrep Precise $tmphtml | head -1 | awk '{print $3}')
trus=$(fgrep Trusty $tmphtml | head -1 | awk '{print $3}')
xenn=$(fgrep Xenial $tmphtml | head -1 | awk '{print $3}')
bion=$(fgrep Bionic $tmphtml | head -1 | awk '{print $3}')

[coreprocess]

Thanks for your message. I will verify and fix the issue this week.

[coreprocess]

These scripts are entirely based on the netboot images. According to my tests, these images are available as before. The netboot approach installs the newest version of packages in always. In case I am extending the current script to support the server images too, I will consider your proposal.