Add Vagrantfile for Ubuntu 20.04 to elaborate installation process and make it efficient and reproducible.

[sekikn]

Hello Prof. Higuchi,

I usually work on Ubuntu and recently set up KH Coder on Ubuntu 20.04, referring to #91.
It was the first time for me to install KH Coder and required some trial-and-error. So I did it on a virtual machine using VirtualBox and Vagrant so that I can keep the local environment clean.
I automated those procedures as Vagrantfile for efficiency and reproducibility, and thought it may be helpful other users.
Is it possible to contribute this under doc_contrib by any chance?

After installing VirtualBox and Vagrant, running vagrant up with this file gives a VM in which KH Coder and its dependencies are already installed, as the attached image.

I tested this only on Linux, but VirtualBox and Vagrant also support Windows and macOS, so it is supposed to work with both of them.

[ko-ichi-h]

Hello,

It looks nice! Thank you.

I tried it on Ubuntu 20.04 but I could not enlarge display resolution. I would like to use it with 1600 x 1200 or something like that. Do you have any clues about it?

Also can you tell us the default root password? Or should we just run "sudo perl kh_coder.pl"?

[sekikn]

Thank you so much for reviewing and merging!

I tried it on Ubuntu 20.04 but I could not enlarge display resolution. I would like to use it with 1600 x 1200 or something like that. Do you have any clues about it?

The following ways both worked in my environment. Could you take a try?

• On the guest OS, launch "Setting" -> select "Displays" -> specify "Resolution" and "Apply".
• On the host OS, enable "Auto-resize Guest Display" from the "View" menu and resize the guest window.

Also can you tell us the default root password? Or should we just run "sudo perl kh_coder.pl"?

It looks like there's no default password for the root user, probably for a security reason.
I usually log in as a general user who is granted permission to promote in advance (i.e., the "vagrant" user here), and then promote to the root user with sudo -i or something. Running sudo perl kh_coder.pl directly should also work as you said.