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

[Julian Andres Klode]

*** This bug is a duplicate of bug 21837 ***
    https://bugs.launchpad.net/bugs/21837

This is being tracked in bug 21837, although the bug might be forgotten
about. Latest work involved inventing a new format for delta debs that
is efficient enough for the whole endeavour to be actually worth it on
modern connections.

** Changed in: update-manager (Ubuntu)
       Status: New => Invalid

** This bug has been marked a duplicate of bug 21837
   debdelta integration / zsync support

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https://bugs.launchpad.net/bugs/1854659

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

Status in update-manager package in Ubuntu:
  Invalid

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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