The simplest installation method to try is:

```bash
python -m pip install -U matplotlib
```

If your installation is managed by Conda:

```bash
conda install matplotlib
```

If your installation is managed by your Linux distribution:

Debian / Ubuntu: 
```bash
sudo apt-get install python3-matplotlib
```

Fedora:
```bash
sudo dnf install python3-matplotlib
```

Red Hat:
```bash
sudo yum install python3-matplotlib
```

Arch:
```bash
sudo pacman -S python-matplotlib
```
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