[Bug 2059349] [NEW] do-release-upgrade doesn't work behind the http(s) proxy

[Maksim Malchuk]

Public bug reported:

Trying to upgrade Ubuntu Focal:

# export https_proxy=http://proxy.lan:3128/
# do-release-upgrade
Checking for a new Ubuntu release
Err Upgrade tool signature
  Temporary failure resolving 'archive.ubuntu.com'
Err Upgrade tool
  Temporary failure resolving 'archive.ubuntu.com'
Fetched 0 B in 0s (0 B/s)
WARNING:root:file 'jammy.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

+ Trying to upgrade Ubuntu Focal:
+ 
  # export https_proxy=http://proxy.lan:3128/
  # do-release-upgrade
  Checking for a new Ubuntu release
  Err Upgrade tool signature
-   Temporary failure resolving 'archive.ubuntu.com'
+   Temporary failure resolving 'archive.ubuntu.com'
  Err Upgrade tool
-   Temporary failure resolving 'archive.ubuntu.com'
+   Temporary failure resolving 'archive.ubuntu.com'
  Fetched 0 B in 0s (0 B/s)
  WARNING:root:file 'jammy.tar.gz.gpg' missing
  Failed to fetch
  Fetching the upgrade failed. There may be a network problem.

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https://bugs.launchpad.net/bugs/2059349

Title:
  do-release-upgrade doesn't work behind the http(s) proxy

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Trying to upgrade Ubuntu Focal:

  # export https_proxy=http://proxy.lan:3128/
  # do-release-upgrade
  Checking for a new Ubuntu release
  Err Upgrade tool signature
    Temporary failure resolving 'archive.ubuntu.com'
  Err Upgrade tool
    Temporary failure resolving 'archive.ubuntu.com'
  Fetched 0 B in 0s (0 B/s)
  WARNING:root:file 'jammy.tar.gz.gpg' missing
  Failed to fetch
  Fetching the upgrade failed. There may be a network problem.

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