Install instruction not working

[skal-dB]

Describe the bug I tried to install VNotes following the instructions here https://app.vnote.fun/en_us/#!docs/Developers/Build%20VNote.md but it doesn't work.

To Reproduce Following given instructions for installing Qt first

usr@mint:~$ sudo apt-get update -qq
usr@mint:~$ sudo apt-get -y install qt512base qt512webengine
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package qt512base
E: Unable to locate package qt512webengine

Expected behavior Installing Qt, then VNotes.

Desktop (please complete the following information):

• OS: Linux Mint Cinnamon
• Version 21.3

[skal-dB]

I also tried with apt instead of apt-get, it's the same result.

[skal-dB]

Typing this finally works

sudo apt update
sudo apt install build-essential
sudo apt install qt5-default
sudo apt install qtcreator
sudo apt install qt5-doc qt5-doc-html qtbase5-doc-html qtbase5-examples

1h and I ain't even start trying to install VNotes... Flatpack would be so much easier.

[skal-dB]

Now I'm trying to install VNotes, I'm still following instructions but still doesn't work as expected.

I'm following these steps now

cd vnote.git
mkdir build
cd build
qmake ../vnote.pro
make
sudo make install

3 first lines goes fine, then this happens with qmake ../vnote.pro

usr@mint:~/vnote.git/build$ qmake ../vnote.pro
qmake: could not exec '/usr/lib/qt5/bin/qmake': No such file or directory

I'll try again one day, but I just spent 1h30 trying to install a note app, it's too much. Not sure how newbies should do. Do I already praised for a Flatpack version ?