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My problem is resolved. During the debian migration, my interfaces were renamed: eth1 => eth2 and eth2 => eth1.

I have encountered the related problem when upgrading from 6 to 7.4.16 with kernel 5.15.116-1-pve. I have 3 ethernet cards: 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11) 04:00.0 Ethernet controller: Realtek...

Had same error after an upgrade from 5.1 to 5.4 (if I remember well). Resolved the problem by commenting source /etc/network/interfaces.d/* in /etc/network/interfaces Even if this folder was empty, those line was the problem.