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升级后没有自动建议软件包吗？

tag-icon • tag-icon apt upgrade 20.04
升级后没有自动建议软件包吗？

我最近从 Ubuntu 18.04 升级到了 20.04。

升级后，我注意到了一点不同。以前，如果我输入系统上不可用的命令，它会自动推荐软件包名称（假设该命令确实存在于某些存储库中）。例如：

$ htop
  Command 'htop' not found, but can be installed with:

  sudo apt install htop

但现在，我只得到：

$ htop
htop: command not found

即现在缺少 apt install 的建议。

知道是什么导致了这种行为的改变吗？

答案1

我发现这是因为缺少软件包（我一定是在升级到 Focal 时意外删除了它，或者它被无意中“自动删除”了）。获取自动建议的方法是安装软件包command-not-found：

$ sudo apt search command-not-found
Sorting... Done
Full Text Search... Done
command-not-found/focal-updates,now 20.04.4 all [residual-config]
  Suggest installation of packages in interactive bash sessions

packagekit-command-not-found/focal 1.1.13-2ubuntu1 amd64
  Offer to install missing programs automatically

python3-commandnotfound/focal-updates,now 20.04.4 all [installed,auto-removable]
  Python 3 bindings for command-not-found.

之前和之后的示例：

$ smartctl
smartctl: command not found
$ sudo apt install command-not-found -y
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  command-not-found
0 upgraded, 1 newly installed, 0 to remove and 14 not upgraded.
Need to get 5240 B of archives.
After this operation, 35.8 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 command-not-found all 20.04.4 [5240 B]
Fetched 5240 B in 0s (18.5 kB/s)           
Selecting previously unselected package command-not-found.
(Reading database ... 43980 files and directories currently installed.)
Preparing to unpack .../command-not-found_20.04.4_all.deb ...
Unpacking command-not-found (20.04.4) ...
Setting up command-not-found (20.04.4) ...
$ smartctl 

Command 'smartctl' not found, but can be installed with:

sudo apt install smartmontools

$

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