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All DEFAULT Ubuntu Server 20.04.1 LTS installation (without Xorg) + 4k hdmi display = not readable tiny text in the console.

Setting GRUB_GFXMODE in /etc/default/grub (from this answer and similar threads) affects only GRUB black and white console output (on bootup), then it jumps to color loading and login Ubuntu console "color loading and login Ubuntu console".

On the monitor with 1080p maximum resolution text scale is normal.

Никита Фомин
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    Please clarify what you mean with "color loading and login Ubuntu console". Is a graphical environment loaded or not? – vanadium Aug 29 '21 at 10:00
  • @NateT xrandr is only applicable if Xorg is running. Typically not on a server. – vanadium Aug 29 '21 at 10:25
  • Is the log not recorded? Why not just look at it from inside the OS after boot if it will not resize in the TTY? – Nate T Aug 29 '21 at 16:40

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From Google:

To adjust the font/font-size used for the TTY, run sudo dpkg-reconfigure console-setup , which will guide you through the steps to choose a font and font-size...

This is what I get when googling. But I cannot vouch personally for this, as I have never tried it personally. My advice would be to look into the console-setup package.dpkg-reconfigure has a man-page, and is a fairly common command. It is part of the debconf package, and is the same as running sudo dpkg --reconfigure.

I will link the result, to give you a lead into your research. From what I can tell, you will get a prompt menu that walks you through the process, making it fairly straightforward, but I would recommend confirming for yourself. This is meant only to point you in the general direction of the answer.

Nate T
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    This answer is not applicable: the question is about the font size in the tty, i.e. the terminal before any graphical server is loaded, or which you can reach with Ctrl+Alt+F3 and up. You may consider deleting the answer. – vanadium Aug 29 '21 at 09:44
  • @vanadium hail mary. Does this look better? Mind you, it is google's answer, not mine, but I'm hoping it is at least vaguely helpful this time.. – Nate T Aug 29 '21 at 10:55