我创建了 linux ubuntu 容器，但我厌倦了运行 python 脚本。
但它会引发这个错误：
<frozen importlib._bootstrap>:228: RuntimeWarning: Linux supports fsync/fdsync with io_submit since 4.18 but current kernel 4.15.0-55-generic doesn't support it. Related calls will have no effect.
如何更新 docker 容器内的 ubuntu 内核？
有dockerfile：
FROM ubuntu:21.04
RUN apt-get update -y
RUN apt-get upgrade -y
RUN apt-get dist-upgrade -y
RUN apt-get install python3.9 -y
RUN apt-get install python3-pip -y