Bug#954807: apt upgrade sometimes marks packages as manually installed

[Piotr Engelking <inkerman42@gmail.com>]

Package: apt
Version: 2.0.0
Severity: normal


When a package listed as an argument to apt upgrade is already at the
requested version, it is marked as manually installed:

# apt-mark showmanual libc6
# apt upgrade libc6
Reading package lists... Done
Building dependency tree
Reading state information... Done
libc6 is already the newest version (2.30-2).
libc6 set to manually installed.
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
# apt-mark showmanual libc6
libc6
#

Please do not mark packages listed as arguments to apt upgrade as
manually installed.


-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (800, 'testing'), (700, 'unstable'), (600, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.4.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8),
LANGUAGE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages apt depends on:
ii  adduser                 3.118
ii  debian-archive-keyring  2019.1
ii  gpgv                    2.2.19-3
ii  libapt-pkg6.0           2.0.0
ii  libc6                   2.30-2
ii  libgcc-s1               10-20200312-2
ii  libgnutls30             3.6.12-2
ii  libseccomp2             2.4.3-1
ii  libstdc++6              10-20200312-2

Versions of packages apt recommends:
ii  ca-certificates  20190110

Versions of packages apt suggests:
ii  apt-doc                      2.0.0
pn  aptitude | synaptic | wajig  <none>
ii  dpkg-dev                     1.19.7
ii  gnupg                        2.2.19-3
pn  powermgmt-base               <none>

-- no debconf information