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1. bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.accept_ra
   net.ipv6.conf.ens224.accept_ra = 1
   bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.accept_ra_pinfo
   net.ipv6.conf.ens224.accept_ra_pinfo = 1
   bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.autoconf
   net.ipv6.conf.ens224.autoconf = 1
   bab2501@ns1:~$

2. bab2501@ns1:~$ sudo cat /etc/sysctl.conf | grep net.ipv6
   net.ipv6.conf.ens224.accept_ra = 1
   net.ipv6.conf.ens224.accept_ra_pinfo = 1
   net.ipv6.conf.ens224.autoconf = 1
   #net.ipv6.conf.all.forwarding=1
   #net.ipv6.conf.all.accept_redirects = 0
   #net.ipv6.conf.all.accept_source_route = 0

1. dpkg -l | awk '/^rc/ {print $2}' |xargs sudo dpkg --purge

   ¹⁾

2. sudo apt-get autoremove --purge

https://www.cyberciti.biz/faq/install-lxd-on-ubuntu-20-04-lts-using-apt/