Comment 8 for bug 1794053

This bug was fixed in the package apt - 1.6.6

---------------
apt (1.6.6) bionic; urgency=medium

  * Set DPKG_FRONTEND_LOCKED when running {pre,post}-invoke scripts.
    Some post-invoke scripts install packages, which fails because
    the environment variable is not set. This sets the variable for
    all three kinds of scripts {pre,post-}invoke and pre-install-pkgs,
    but we will only allow post-invoke at a later time.
    (LP: #1796808)

apt (1.6.5) bionic; urgency=medium

  [ David Kalnischkies ]
  * Support records larger than 32kb in 'apt show' (Closes: #905527)
    (LP: #1787120)

  [ Julian Andres Klode ]
  * Add support for dpkg frontend lock (Closes: #869546) (LP: #1781169)
  * Set DPKG_FRONTEND_LOCKED as needed when doing selection changes
  * http: Stop pipeline after close only if it was not filled before
    (LP: #1794957)
  * pkgCacheFile: Only unlock in destructor if locked before (LP: #1794053)
  * Update libapt-pkg5.0 symbols for frontend locking

 -- Julian Andres Klode <email address hidden> Tue, 09 Oct 2018 12:16:51 +0200