I can reproduce it but only in:
* GNOME Shell 3.36.4
* KDE Plasma Shell 5.18.5

But in XFCE, LXDE, LXQT, MATE and others <Ctrl>+<Aly>+<F(n)> works fine
for me.

At first, I've tried to use `sudo chvt 2` for switching form KDE on tty1 to Raw 
Console on tty2. After switching to tty2 <Ctrl>+<Aly>+<F(n)> works as in early 
days.
It doesn't depends on video drivers or kernel flags and etc. For my laptop I've 
got the same  for nvidia:455.38 and for i915, with modeset and with nomodset, 
with GFX grub mode and without. 

But I guess, this is not a system or hardware problem, because there are no any 
troubles with small environments.  So after some research I found, that you can 
use `sudo kbd_mode`. 
 
So for me `sudo kbd_mode -af` works fine without reboot.

* Laptop: DellXps 15 9570 4K Touch
* Operating System: Kubuntu 20.04
* Kernel Version: 5.8.0-7630-generic #32~1605108853~20.04~8bcf10e~dev-Ubuntu 
(from system76)
* OS Type: 64-bit
* Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
* Memory: 15,4 Gib

Unfortunately I cannot find `DontVTSwitch` option in xorg.conf-like all-over 
the system, as was said for example here:
* 
https://unix.stackexchange.com/questions/34158/rebinding-disabling-ctrlaltf-virtual-terminal-console-switching

I think it'll be better solution.

The solution of Fredrik Öhrström (oehrstroem) also sounds great.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1758512

Title:
  No virtual terminals (CTRL+ALT+F?) when no user logged in; erratic
  behaviour when user logged in.

Status in gdm3 package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in mutter package in Ubuntu:
  Confirmed

Bug description:
  As of today's 18.04 version, on a dell xps-13 (the old i7-4500U one), to 
reproduce:
  - boot Ubuntu
  - Press Ctrl+Alt+F2 (or F3 or...)

  Expected behaviour: virtual console should appear with login prompt.
  Actual behaviour: nothing happens.

  When a user is logged in, Ctrl+Alt+F3 switches to terminal tty3...
  However, hitting first Ctrl+Alt+F1 and, subsequently, hitting
  Ctrl+Alt+F3 does not show tty3, and remains at the graphical login
  screen but keyboard and mouse are unresponsive until either
  Ctrl+Alt+F1 or Ctrl+Alt+F? are pressed, being ? the virtual terminal
  the ubuntu session is running at.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gdm3 3.27.92-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  Uname: Linux 4.15.0-12-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar 24 10:11:26 2018
  InstallationDate: Installed on 2014-05-05 (1418 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: gdm3
  UpgradeStatus: Upgraded to bionic on 2018-03-22 (1 days ago)

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