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It's impossible to write this way, text gets deleted, windows change, random tabs open. I've tried every solution I came across but none actually solve it (some don't even work)

I've tried installing touchpad indicator, I've tried adding a syndaemon option from startup application, I tried the same but from the terminal, nothing works.

I Just want to disable the touchpad completely while typing, no scrolling, no moving the cursor, nothing.

I suggest installing libinput it has much better "disable while typing" and "palm detection" algorithms.

Run

sudo apt install xserver-xorg-input-libinput

and restart the GUI session, or reboot.

If you need "tap to click", you can add

Option "Tapping" "true"

to the touchpad section of /usr/share/X11/xorg.conf.d/90-libinput.conf.

All options can be found on the manual page.

If you are using Ubuntu 16.04 with the -hwe-16.94 stack, you will need to install xserver-xorg-input-libinput-hwe-16.04 package instead of xserver-xorg-input-libinput.

You can check which HWE stack is installed by checking if xserver-xorg or xserver-xorg-hwe-16.04 package is installed.

Open System Settings -> Mouse & Touchpad : in the Touchpad section switch from ON to OFF

Additional information for other users reading this post : The answer was written before the content of the question was changed, originally the question was : "An actual solution to disable touchpad? I just want to disable the touchpad completely, no scrolling, no moving the cursor, nothing." - so the answer from @Pilot6 is the much better solution for what the current version of the question is asking about !

You can also do it with Synaptics.

synclient PalmDetect=1

That will not be permanent, but you can do this by creating or editing the following file and adding Option "PalmDetect" "1"

# /etc/X11/xorg.conf.d/70-synaptics.conf

Section "InputClass"

  Identifier "touchpad"

  Driver "Synaptics"

    Option "PalmDetect" "1"

EndSection

https://wiki.archlinux.org/index.php/Touchpad_Synaptics#Disable_touchpad_while_typing

In my eyes, palmdetect is not exactly "disable while typing", because this feature doesn't really consider what's happening on the keyboard. In my case, I don't permanently touch the pad while typing, so the detection didn't work properly. On the same link that HarlemSquirrel already posted, there's also a second solution which does exaclty what is requested (in the modified OP):

Using syndaemon syndaemon monitors keyboard activity and disables the
touchpad while typing. It has several options to control when the
disabling occurs. View them with $ syndaemon -h For example, to disable tapping and scrolling for 0.5
seconds after each keypress (ignoring modifier keys like Ctrl), use

syndaemon -i 0.5 -t -K -R

Once you have determined the options you
like, you should use your login manager or xinitrc to have it run
automatically when X starts. The -d option will make it start in the
background as a daemon.

This is very similar to How do I disable a touchpad using the command line? which recommends the synclient program.

If you have a Synaptics touchpad, then you can bind hotkeys to turn the pad off and on with

• synclient TouchpadOff=1


• synclient TouchpadOff=0