Creating new Buster container is busted

We don't update the cache, so we try fetching an old (non-existant) package:

Starting build: Fri Dec  4 13:52:13 2020
Reading package lists...
Building dependency tree...
The following additional packages will be installed:
  ca-certificates dbus default-jre-headless fontconfig-config
  fonts-dejavu-core java-common krb5-locales libasound2 libasound2-data
  libavahi-client3 libavahi-common-data libavahi-common3 libcups2 libdbus-1-3
  libexpat1 libfontconfig1 libfreetype6 libgssapi-krb5-2 libjpeg62-turbo
  libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0 liblcms2-2 libnspr4
  libnss3 libpcre2-8-0 libpcsclite1 libpng16-16 libpsl5 libsqlite3-0 libx11-6
  libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxi6 libxrender1 libxtst6
  openjdk-11-jre-headless openssl publicsuffix ucf x11-common
Suggested packages:
  default-dbus-session-bus | dbus-session-bus default-jre libasound2-plugins
  alsa-utils cups-common krb5-doc krb5-user liblcms2-utils pcscd libnss-mdns
  fonts-dejavu-extra fonts-ipafont-gothic fonts-ipafont-mincho
  fonts-wqy-microhei | fonts-wqy-zenhei fonts-indic
The following NEW packages will be installed:
  ca-certificates ca-certificates-java dbus default-jre-headless
  fontconfig-config fonts-dejavu-core java-common krb5-locales libasound2
  libasound2-data libavahi-client3 libavahi-common-data libavahi-common3
  libcups2 libdbus-1-3 libexpat1 libfontconfig1 libfreetype6 libgssapi-krb5-2
  libjpeg62-turbo libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0
  liblcms2-2 libnspr4 libnss3 libpcre2-8-0 libpcsclite1 libpng16-16 libpsl5
  libsqlite3-0 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxi6
  libxrender1 libxtst6 openjdk-11-jre-headless openssl publicsuffix ucf wget
  x11-common
0 upgraded, 47 newly installed, 0 to remove and 0 not upgraded.
Need to get 48.4 MB of archives.
After this operation, 200 MB of additional disk space will be used.
[snip]
Err:37 http://deb.debian.org/debian buster/main amd64 libx11-data all 2:1.6.7-1
  404  Not Found [IP: 151.101.122.132 80]
Get:38 http://deb.debian.org/debian buster/main amd64 libx11-6 amd64 2:1.6.7-1 [754 kB]
Get:39 http://deb.debian.org/debian buster/main amd64 libxext6 amd64 2:1.3.3-1+b2 [52.5 kB]
Get:40 http://deb.debian.org/debian buster/main amd64 libxi6 amd64 2:1.7.9-1 [82.6 kB]
Get:41 http://deb.debian.org/debian buster/main amd64 libxrender1 amd64 1:0.9.10-1 [33.0 kB]
Get:42 http://deb.debian.org/debian buster/main amd64 x11-common all 1:7.7+19 [251 kB]
Get:43 http://deb.debian.org/debian buster/main amd64 libxtst6 amd64 2:1.2.3-1 [27.8 kB]
Err:44 http://deb.debian.org/debian buster/main amd64 openjdk-11-jre-headless amd64 11.0.6+10-1~deb10u1
  404  Not Found [IP: 151.101.122.132 80]
Get:45 http://deb.debian.org/debian buster/main amd64 default-jre-headless amd64 2:1.11-71 [10.9 kB]
Get:46 http://deb.debian.org/debian buster/main amd64 ca-certificates-java all 20190405 [15.7 kB]
Get:47 http://deb.debian.org/debian buster/main amd64 publicsuffix all 20190415.1030-1 [116 kB]
Fetched 10.8 MB in 0s (49.8 MB/s)