Bug#966554: how to apply the workaround?

[quixote]

Dumb question time, because I'm still not seeing the updates to fix 
grub, and running grub-install /dev/sda still gets me the same errors 
about "no space left on device." (I checked: it's 200MB, and has 98% 
free space.)

I only have two repositories in my sources.list, since I have a plain 
vanilla install of buster. (Plus a repo for virtualbox)
______________________________________________________
  Debian packages for stable
deb http://ftp.citylink.co.nz/debian/ stable main contrib

# Security updates for stable
deb http://security.debian.org/ stable/updates main contrib
------------------------------------------------------------------------------------
Do I maybe not have the right repo?  Adding:

deb     http://deb.debian.org/debian buster-updates main

and/or

deb http://deb.debian.org/debian/ buster-proposed-updates main


didn't seem to bring up any useful packages (just a ca-certificates one).

Any ideas what the issue might be?

Thanks!
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