latest stack.sh raise error

[ggg]

with ubuntu 2004 server lts:

run ./stack.sh

+inc/python:pip_install:129 xtrace='set -o xtrace'
+inc/python:pip_install:130 set +o xtrace
Using python 3.8 to install os-testr
+inc/python:pip_install:190 sudo -H LC_ALL=en_US.UTF-8 SETUPTOOLS_USE_DISTUTILS=stdlib http_proxy= https_proxy= no_proxy= PIP_FIND_LINKS= python3.8 -m pip install -c /opt/stack/requirements/upper-constraints.txt -U os-testr
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f686fb3fe50>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/os-testr/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f686fb3fa30>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/os-testr/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f686fb3f9d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/os-testr/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f686fb3f2e0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/os-testr/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7f686fb3f0d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/os-testr/
ERROR: Could not find a version that satisfies the requirement os-testr===3.0.0 (from -c /opt/stack/requirements/upper-constraints.txt (line 448)) (from versions: none)
ERROR: No matching distribution found for os-testr===3.0.0 (from -c /opt/stack/requirements/upper-constraints.txt (line 448))
+inc/python:pip_install:1 exit_trap

[ggg (kkk8)]

code version: commit f7d15274f69922c7f91da444a6e10f96cf325575

[Dr. Jens Harbott (j-harbott)]

This sounds like an error in your host setup with DNS resolution being broken. Please double-check your installation.

[Launchpad Janitor (janitor)]

[Expired for devstack because there has been no activity for 60 days.]