apt (or apt-get) cannot find a package that should be there

[Eric S Fraga <e.fraga@ucl.ac.uk>]

Hello,

I am trying to install cmake on a buster system.  When I try "apt
install cmake" (or equivalently with apt-get), I am told the package
doesn't exist.  I have updated, checked and cleaned using apt-get
several times.  The database is somehow corrupt as I know that cmake
exists: searching on Debian's website clearly shows it there for
buster and looking at the actual deb site shows cmake there.

My apt/sources.list file is:

    deb http://ftp.uk.debian.org/debian/ buster main non-free contrib
    deb-src http://ftp.uk.debian.org/debian/ buster main non-free contrib

    deb http://security.debian.org/debian-security buster/updates main non-free contrib
    deb-src http://security.debian.org/debian-security buster/updates main non-free contrib
    deb     [arch=amd64] http://emacs.secretsauce.net unstable main
    deb-src [arch=amd64] http://emacs.secretsauce.net unstable main

Any suggestions on how to fix this?

Thanks,
eric

-- 
Eric S Fraga via Emacs 27.0.50 & org 9.1.13 on Debian buster/sid

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