Please, help me! Ubuntu is unusable, Ethernet keeps disappearing. I mean I have to keep restarting PC every 20 minutes - 1 hour to gain back internet connection. I have integrated realtek card (Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)), thought it was broken - bought dedicated network card from tp-link (TG-3468), both, integrated and dedicated cards use same r8169 kernel module, and it seems there is something terribly wrong with it…
(same problem on Ubuntu 23.04 and 23.10)