How to set proxy settings in Ubuntu terminal?

How to set proxy settings in command line?

I use Ubuntu 12.04. I can use the following command to set a proxy:
Env proxy. Is there any way I can do this automatically for all my computers? The problem is, if I am not connected to the internet when I set this option, nothing changes and I have to restart the command. Is there any way I can restart all these processes automatically? If you're worried about accidentally touching the global PATH, it's easy to put the above in a .bashprofile file (create one if it doesn't already exist) This works in ubuntu 16.04 and 18.04
#!/bin/bash. # List all directories in PATH. Find / -type d. # Unset Proxy. Unset HTTPPROXY. Unset HTTPSPROXY. Unset NOPROXY. Unset HTTPNOPROXY. Unset HTTPSNOPROXY. # Set new Proxies. Export HTTPPROXY=. Export HTTPSPROXY=. Export NOPROXY=domain.com,subdomain.

How do I configure proxy server in Ubuntu?

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Iptables Which one would best for beginners? I am not new to Linux, but the last time I installed a server it was kinda complex. Should I go with Lubuntu then or Xubuntu. I'm just not that familiar with this type of stuff anymore. Please point out anything I missed in my list of what I need to do.
taym, Lubuntu would be fine. ok so I tried changing /boot/grub. If I press that then I get the grub4dos command prompt with Ubuntu installed etc. But even once I do this, when I try editing grub in Ubuntu again I get the same issue I'd previously gotten. No change
and I can't boot because I can't remove my Windows partition. Grub2 says "Invalid" every time. I keep trying to fdisk -l and it just says "FAT32, LBA, BSD disk" which is fine, because that's what I have in my BIOS. I also have no idea how to change the partition type to gpt, it refuses to let me because I'm in ubuntu trying to fix this
any way I could get a working live USB? Or better a working live CD?