Comment # 6 on bug 998838 from Aleksa Sarai

> $ gpg -K
> /home/linux/.gnupg/pubring.kbx
> ------------------------------
> sec   rsa2048 2016-04-22 [SC]
>       BFB0D21365677975D97D35D117D339F8D96F132C
> uid           [ultimate] Hm hm hm!
> ssb   rsa2048 2016-04-22 [E]
> 
> [...]
> 
> $ git commit --amend -SBFB0D21365677975D97D35D117D339F8D96F132C
> [master 2ebd3bf] Second commit
>  Date: Mon Sep 19 17:22:09 2016 +0200
>  1 file changed, 1 insertion(+)
> 
> Works by e-mail, too. I think you'll have to replicate it on a clean install.

Alright, I'll set up a VM to test this.