Perhaps they are blocking by user agents.
bdmurray@clean-cosmic-amd64:/tmp/ubuntu-release-upgrader-rdj71yjw$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import utils
>>> utils.url_downloadable('http://mirrors.digitalocean.com/ubuntu/dists/disco/Release',
>>> print)
url_downloadable: http://mirrors.digitalocean.com/ubuntu/dists/disco/Release
s='http' n='mirrors.digitalocean.com' p='/ubuntu/dists/disco/Release' q='' f=''
send: b'HEAD /ubuntu/dists/disco/Release HTTP/1.1\r\nAccept-Encoding:
identity\r\nHost: mirrors.digitalocean.com\r\nUser-Agent:
Python-urllib/3.6\r\nConnection: close\r\n\r\n'
reply: 'HTTP/1.1 403 Forbidden\r\n'
header: Date: Tue, 23 Apr 2019 19:02:25 GMT
header: Content-Type: text/html; charset=UTF-8
header: Connection: close
header: Set-Cookie: __cfduid=d5e9b6d1be64106c99e8a26d9faf281c41556046145;
expires=Wed, 22-Apr-20 19:02:25 GMT; path=/; domain=.digitalocean.com; HttpOnly
header: Cache-Control: max-age=10
header: Expires: Tue, 23 Apr 2019 19:02:35 GMT
header: X-Frame-Options: SAMEORIGIN
header: Vary: Accept-Encoding
header: Server: cloudflare
header: CF-RAY: 4cc21776da5d29fb-SEA
error from httplib: 'HTTP Error 403: Forbidden'
False
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https://bugs.launchpad.net/bugs/1825938
Title:
Cannot update to 19.04 ubuntu-minimal could not be located
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