How to сonfigure proxy?

[elllkk]

Where can I find proxy for htt p, htt ps ect.?
VB:latest
Windows:10
Linux Ubuntu on VB

[socratis]

For future reference, "current version", "latest version", "previous version" don't (generally speaking) provide accurate information. In a couple of months the "current" will definitely be different. It's better if you use the complete version numbers (including the build numbers) to identify software:

• "OSX" isn't enough, "OSX 10.9.5 build 13f1911" is much better.
• "Ubuntu" isn't enough, "Ubuntu 16.04, 4.4.0-59-generic #80-Ubuntu SMP" is much better.
• "Win10" isn't enough, "Win10 1607, build 14393.969" is much better.
• "The latest" is not enough, "VirtualBox 5.1.22 r115126" is much better.

Where do you need to enter the proxy information? In the host or in the guest?

VirtualBox doesn't have proxy information, except in its Preferences to search for updates, and it should auto-detect the same settings as your host.

VirtualBox does not deal with proxies in the guests.