I download Electrum AppImage but it do nothing.
I do not insist. I just like to use it

It has to be set as executable before it can be launched like an app.
Tutorial:
docs.appimage.org/introduction/quickstart.htmlx@x-xxx:~$ python3 -m pip install --user Electrum-4.5.8.tar.gz
error: externally-managed-environment
× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
python3-xyz, where xyz is the package you are trying to
install.
Hmm, it's thinking that you're installing a python package and not the downloaded "
Electrum-4.5.8.tar.gz" file.
I can't reproduce it in Ubuntu 22.04.3 though, I don't use Linux Mint.
Anyways, you can still use Electrum without installing it. Just follow the "
Run without installing:" part in the instructions;
The first command extracts the tar.gz file,
The second command is for launching Electrum. (
use every time you need to start Electrum)
The inconvenience of not installing it is you can't start it with a simple command "
electrum".
1. OK is useful. but is not in manual on electrum.org
2. 3. 4. I see file Electrum-4.5.8.tar.gz in my computer. Yes is unpacking, and work. mean must be downloaded.