Comment 54 for bug 1807023

trusty verification:

reproduce bug:
1) get the debian-installer source version 20101020ubuntu318.44 and extract
2) in the source cd build/
3) make build_netboot
4) cd dest/netboot/ubuntu-installer/amd64
5) run steps from comment 1
6) verify wget from github.com fails due to https certificate:

~ # wget http://github.com
--2018-12-19 20:04:55-- http://github.com/
Resolving github.com... 192.30.253.113, 192.30.253.112
Connecting to github.com|192.30.253.113|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://github.com/ [following]
--2018-12-19 20:04:55-- https://github.com/
Connecting to github.com|192.30.253.113|:443... connected.
ERROR: cannot verify github.com's certificate, issued by '/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 Extended Validation Server CA':
  Unable to locally verify the issuer's authority.
To connect to github.com insecurely, use `--no-check-certificate'.

verify fix is same steps except with debian-installer version 20101020ubuntu318.45

step #6 passes:

~ # wget github.com
--2018-12-19 20:09:44-- http://github.com/
Resolving github.com... 192.30.253.112, 192.30.253.113
Connecting to github.com|192.30.253.112|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://github.com/ [following]
--2018-12-19 20:09:44-- https://github.com/
Connecting to github.com|192.30.253.112|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: 'index.html'

    [ <=> ] 80,096 --.-K/s in 0.04s

2018-12-19 20:09:44 (1.77 MB/s) - 'index.html' saved [80096]