为什么 tlmgr 存在 verify_checksum 问题？

Question

我有一个 Docker 映像

FROM ubuntu:20.04
ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update
RUN apt-get install -y texlive-xetex \
    texlive-lang-french texlive-fonts-extra texlive-science \
    latexmk git python3

我想从中安装latexindent。问题是我无法使用 tlmgr：

root@fba0091062ef latex 
$ tlmgr option repository ctan
(running on Debian, switching to user mode!)
TLPDB: not a directory, not loading: /root/texmf
tlmgr: running in usermode, did you call `tlmgr init-usertree'?

root@fba0091062ef latex 
$ tlmgr init-usertree

root@fba0091062ef latex 
$ tlmgr update --self
(running on Debian, switching to user mode!)

/usr/bin/tlmgr: unexpected return value from verify_checksum: -5

我为什么会遇到这个问题？