How to resolve installation error via pip on ubuntu 20.04?

Question

ubuntu

When installing any library via pip, an error occurs:

$ pip install NumPy
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/numpy/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/numpy/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/numpy/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/numpy/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/numpy/
ERROR: Could not find a version that satisfies the requirement NumPy (from versions: none)
ERROR: No matching distribution found for NumPy

Proxy installation works
python.exe-m pip install numpy --proxy= "179.185.199.195:8080"

Disabling ufw doesn't help.

As Google suggests, you need to change some file in ubuntu. But unfortunately no instructions.

Answer 1

Understood the problem.
Solutions 1.
Contact the networkers and find out the MTU for which they have. Then rewrite the settings in unix.
Example:

ip link set eth0 mtu 1450
ip route add 192.168.1.0/24 dev eth0 advmss 1410

more details about the value here
Solution 2 : (which I used)
Ask the networkers on your side to disable their network bells and whistles (protection from DDoS and other necessary things), or move you to a separate circuit / segment (each has its own bells and whistles inside) where you can safely sit on default settings and communicate with the external network.

Answer 2

Figure out what's up with your internet. The problem, judging by the error, is purely network / firewall / antivirus.