[Bug 1854659] [NEW] Could you make "Software Updater" download only the parts that have changed?

[Clinton H]

Public bug reported:

1) Ubuntu 19.10
2) Software Updater 1:19.04.8
3) Only download parts of the package that have changed, if the package is in the APT archive. Otherwise download full package. This would save bandwidth and result in quicker updates if a user has a slow internet connection. Torrents divide a file into hashes and only download the missing parts. Could updates work in a similar way? Maybe zSync could be used. https://www.fosslinux.com/7890/zsync-file-transfer-utility-to-download-only-new-parts-of-a-file.htm
4) Full packages were downloaded instead the parts that changed.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Could you make "Software Updater" download only the parts that have
  changed?

Status in update-manager package in Ubuntu:
  New

Bug description:
  1) Ubuntu 19.10
  2) Software Updater 1:19.04.8
  3) Only download parts of the package that have changed, if the package is in the APT archive. Otherwise download full package. This would save bandwidth and result in quicker updates if a user has a slow internet connection. Torrents divide a file into hashes and only download the missing parts. Could updates work in a similar way? Maybe zSync could be used. https://www.fosslinux.com/7890/zsync-file-transfer-utility-to-download-only-new-parts-of-a-file.htm
  4) Full packages were downloaded instead the parts that changed.

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