[Bug 1609940] Re: aptitude 0.7.4-2ubuntu2 outputs permission warning when asked to display a changelog ("C")

[Joe Philipps]

an example of the error:

W: Can't drop privileges for downloading as file '/tmp/aptitude-
root.5911:sKTBKi/aptitudeDownload6J+8J:+PsVGmTNm^.^::Lz:%.Hi55VKA'
couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission
denied)

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https://bugs.launchpad.net/bugs/1609940

Title:
  aptitude 0.7.4-2ubuntu2 outputs permission warning when asked to
  display a changelog ("C")

Status in aptitude package in Ubuntu:
  New

Bug description:
  After selecting all available updates (key "U"), on the confirmation
  screen (key "g"), after highlighting a package (up/down arrow keys)
  and asking for the changelog (key "C"), the changelog is downloaded
  and displayed, except a red background warning is shown that after
  dropping privileges (changing to user _apt) the program encountered a
  Permission denied error.  Logging in on another virtual console and
  listing /tmp shows that the directory aptitude<random> is owned by
  root, group root, with "rwx" for the owner and no other mode bits set.
  Ergo when a process sets its UID to the one for _apt (118), no
  operations will be possible inside that directory.

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