Install Texmaccs ubuntu 20.04

I am unable to install texmacs on ubuntu 20.04. I got
Depends: libqtcore4 (>= 4:4.7.0~beta1) but it is not installable
Depends: libqtgui4 (>= 4:4.8.0) but it is not installable
Also i try to follows Step by Step installation
but I got
dpkg-buildpackage -us -uc -b

PS: I am an amateur on Linux.

If you are new to Linux or TeXmacs, there is no need to compile the source packages for the moment. To solve the dependence issue (in Ubuntu), you can have a try apt --fix-broken install (in terminal). If failed, it might be better to paste all the terminal output instead of just the lines you have pasted.

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the post has been update with the terminal output

What you pasted, in particular the command dpkg-buildpackage, is about building from source code. I recommend you to ignore that guide. As explained, building is only necessary when you need pre-compilation customization, and since you don’t have much experience in Linux, I don’t think that it is a good idea to waste a lot of time on it. What you need to do is follow this guide, download the 64 bits package and install (by the way, you need sudo before that command to install the package, like sudo dpkg -i TeXmacs-1.99.13-*.deb).

By the way, it is better to surround your paste terminal output by ```.

Example:
```
some code here
```

will be rendered as

some code here

which has a better visual effect.

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Awesome, After many months, I am now able to reuse Texmacs.
Thank you very much.
I want to mark the post as answer but I can’t see the best answers tab .