To enable IPv6 in PVE (Proxmox Virtual Environment), please follow these steps:

1. Edit the file /etc/sysctl.conf and add the following lines at the end:

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net.ipv6.conf.all.accept_ra=2
net.ipv6.conf.default.accept_ra=2
net.ipv6.conf.vmbr0.accept_ra=2
net.ipv6.conf.all.autoconf=2
net.ipv6.conf.default.autoconf=2
net.ipv6.conf.vmbr0.autoconf=2

2. Run the command sysctl -p or restart your host. Then, enter the command ifconfig to check if an IPv6 address has been assigned.

After completing these steps, your PVE system should have IPv6 functionality enabled.