Chocolatey安装上周开始失败。Dockerfile以

FROM python:3.8.2-windowsservercore-ltsc2016
SHELL ["powershell","-Command"]
RUN "Set-ExecutionPolicy Bypass -Scope Process -Force; [Net.ServicePointManager]::SecurityProtocol = 'tls12'; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))"

log说：

Forcing web requests to allow TLS v1.2 (Required for requests to Chocolatey.org)
Getting latest version of the Chocolatey package for download.
Not using proxy.
Getting Chocolatey from https://community.chocolatey.org/api/v2/package/chocolatey/2.0.0.
Downloading https://community.chocolatey.org/api/v2/package/chocolatey/2.0.0 to C:\Users\ContainerAdministrator\AppData\Local\Temp\chocolatey\chocoInstall\chocolatey.zip
Not using proxy.
Extracting C:\Users\ContainerAdministrator\AppData\Local\Temp\chocolatey\chocoInstall\chocolatey.zip to C:\Users\ContainerAdministrator\AppData\Local\Temp\chocolatey\chocoInstall
Installing Chocolatey on the local machine
The registry key for .Net 4.8 was not found or this is forced

Downloading 'https://download.visualstudio.microsoft.com/download/pr/2d6bb6b2-226a-4baa-bdec-798822606ff1/8494001c276a4b96804cde7829c04d7f/ndp48-x86-x64-allos-enu.exe' to 'C:\Users\ContainerAdministrator\AppData\Local\Temp\ndp48-x86-x64-allos-enu.exe' - the installer is 100+ MBs, so this could take a while on a slow connection.

Installing 'C:\Users\ContainerAdministrator\AppData\Local\Temp\ndp48-x86-x64-allos-enu.exe' - this may take awhile with no output.

.NET Framework 4.8 was installed, but a reboot is required. 

Please reboot the system and try to install/upgrade Chocolatey again.

如何解决这一问题？