Hmm it's look like i use r8169 in 19.04 (kernel 4.18). I can get ~400Mbps there.
Sadly r8169 dosen't seem available with kernel 5.
eanmarc@astrolabe:~$ uname -a
Linux astrolabe 4.18.0-17-generic #18-Ubuntu SMP Wed Mar 13 14:34:40 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
jeanmarc@astrolabe:~$ lspci -k -nn | grep -A 3 -i net
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 16)
Subsystem: Gigabyte Technology Co., Ltd Onboard Ethernet [1458:e000]
Kernel driver in use: r8169
Kernel modules: r8168
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https://bugs.launchpad.net/bugs/1826581
Title:
Slow wired Ethernet Realtek 8118
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