Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.3-rc5/
Mainline kernel disables r8169's ASPM, so it may help.
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https://bugs.launchpad.net/bugs/184102
Same problem withe HWE kernel 5.0.0-25-generic so it seemns an
neverending problem with realtek kernel drivers. Is there a chance to
get this working correctly ?
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8169 PCI
Gigabit Ethernet Controller [10ec:8169] (rev 10)
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Converted to question:
https://answers.launchpad.net/ubuntu/+source/linux/+question/683140
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Bug reports are not intended for support. Yes Ubuntu 18.04 LTS has the
option to use 18.10/19.04/19.10/20.04 kernels through use of enabling
the HWE kernels (hardware enablement stack kernel), where current 5.0 >