Manual install fail | Solved | Ubuntu 20.10 arm64 Raspberry Pi 3

### Step 1: Please describe your environment

* ZeroNet version: Latest git clone as of right now (Version: 0.7.2 r4555, Python 3.8.6 (default, Sep 25 2020, 09:36:53))
* Operating system: Ubuntu 20.10 arm64 Raspberry Pi 3
* Web browser: n/a
* Tor status: n/a
* Opened port: n/a
* Special configuration: n/a

### Step 2: Describe the problem:

Error upon installation.

#### Steps to reproduce:

Install latest Ubuntu 20.10 arm64 Raspberry Pi 3 image.
Update packages.
git clone https://github.comHelloZeroNet/ZeroNet
sudo apt-get install python3-pip
sudo python3 -m pip install -r requirements.txt

#### Observed Results:

**ERROR: Could not build wheels for coincurve which use PEP 517 and cannot be installed directly**

#### Expected Results:

Install depends.

#### Solution:

https://pypi.org/project/coincurve/

On Debian/Ubuntu the necessary system packages are:

build-essential
automake
pkg-config
libtool
libffi-dev
python3-dev (or python-dev for Python 2)
libgmp-dev (optional)

I installed all packages listed. New packages that installed: autoconf autotools-dev libgmpxx4ldbl libltdl-dev m4

ZeroNet now launches.

Start with requirements.txt and the reported installation steps on Ubuntu 20.10 arm64 for Raspberry Pi 3. Check the coincurve build prerequisites listed in the issue; done means the dependencies install successfully and ZeroNet launches, though the issue already records a working solution.

Escrito por el modelo de indexación a partir del texto del issue.