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Deal first with update-alternatives, then do the symlink cleanup.

This avoids errors like this:

Removing iptables (1.8.2-2) ...
update-alternatives: warning: forcing reinstallation of alternative
 /usr/sbin/iptables-nft because link group iptables is broken
update-alternatives: warning: forcing reinstallation of alternative
 /usr/sbin/ip6tables-nft because link group ip6tables is broken
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>