can't install salt-minion

[andeson raun]

salt-common : 依赖: python3-tornado4 (>= 4.2.1) 但无法安装它
               依赖: python3-tornado4 (< 5) 但无法安装它
               推荐: python3-croniter 但是它将不会被安装

root@NanoServer-T4:/omv# apt install python3-tornado
正在读取软件包列表... 完成
正在分析软件包的依赖关系树
正在读取状态信息... 完成
建议安装：
  python3-pycurl python3-twisted
下列【新】软件包将被安装：
  python3-tornado
升级了 0 个软件包，新安装了 1 个软件包，要卸载 0 个软件包，有 61 个软件包未被升级。
需要下载 284 kB 的归档。
解压缩后会消耗 1,657 kB 的额外空间。

Googles translates as:

salt-common: Dependency: python3-tornado4 (>= 4.2.1) but cannot install it
                Dependency: python3-tornado4 (< 5) but unable to install it
                Recommend: python3-croniter but it is not going to be installed

root@NanoServer-T4:/omv# apt install python3-tornado
Reading package list... Done
Analyzing the dependency tree of the package
Reading status information... Done
Recommended installation:
   python3-pycurl python3-twisted
The following [new] packages will be installed:
   python3-tornado
0 software packages have been upgraded, 1 software package has been newly installed, and 0 software packages have to be uninstalled. 61 software packages have not been upgraded.
Need to download a 284 kB archive.
After decompression, 1,657 kB of additional space will be consumed.

[Paul White (paulw2u)]

Is this still an issue and if so with which version(s) of Ubuntu?

[Launchpad Janitor (janitor)]

[Expired for salt (Ubuntu) because there has been no activity for 60 days.]