[Bug 1864280] Re: software-properties-gtk removes [arch=amd64]

[James C.]

I've independently discovered this and reported it here:
https://trisquel.info/en/forum/software-properties-gtk-erases-options-single-line-software-sources-and-does-not-revert-them-b

The right fix depends on:
- whether software-properties should cope with source options which are not known to it
-- if so, it will have to store either the whole option string or the unknown portion

- whether software-properties is intended to be mechanism for editing
source options, or if that's an extra for experts who will have to use a
text editor

- how software-properties is intended to interact with DEB822 sources
(man sources.list(5)), which it currently ignores

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https://bugs.launchpad.net/bugs/1864280

Title:
  software-properties-gtk removes [arch=amd64]

Status in software-properties package in Ubuntu:
  Confirmed

Bug description:
  When editing apt sources via software-properties-gtk, additional
  options like [arch=amd64] are removed. With more and more repositories
  deprecating i386, this problem becomes more and more important.

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