apt 升级包统计摘要措辞

Question

由于某种原因，我的机器上的软件包统计摘要行与我见过的其他机器上的软件包统计摘要行不同，而且据我所知，源代码也不同。

$ sudo apt upgrade --assume-no
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.

摘要行显示：

• to upgrade
• to newly install
• to remove
• not to upgrade

源代码似乎显示：

• upgraded
• newly installed
• to remove
• not upgraded

apt-private/private-output.cc

  634    ioprintf(out,_("%lu upgraded, %lu newly installed, "),
  635         Upgrade,Install);
  636 
  637    if (ReInstall != 0)
  638       ioprintf(out,_("%lu reinstalled, "),ReInstall);
  639    if (Downgrade != 0)
  640       ioprintf(out,_("%lu downgraded, "),Downgrade);
  641 
  642    ioprintf(out,_("%lu to remove and %lu not upgraded.\n"),
  643         Dep.DelCount(),Dep.KeepCount());

LSB 信息

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"

在另一台 Xenial 主机上，我看到了预期的行：

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

有人知道这个不同的措辞是从哪里出现的吗？

安装版本：

apt is /usr/bin/apt
apt: /usr/bin/apt
apt:
  Installed: 1.2.26
  Candidate: 1.2.26
  Version table:
 *** 1.2.26 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.2.15ubuntu0.2 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     1.2.10ubuntu1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages