In my case the bug is in the receiving direction. I see no problems with
transmitting.

Here is the output of lspci -vv (for only the ethernet controller in
question) on the broken system. Below, I have the output from the
working system.

Broken system:

01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 15)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI 
Express Gigabit Ethernet Controller
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 18
        Region 0: I/O ports at 3000 [size=256]
        Region 2: Memory at a1204000 (64-bit, non-prefetchable) [size=4K]
        Region 4: Memory at a1200000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 01
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, 
L1 <64us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- 
SlotPowerLimit 10.000W
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 4096 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ 
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit 
Latency L0s unlimited, L1 <64us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, 
NROPrPrP-, LTR+
                         10BitTagComp-, 10BitTagReq-, OBFF Via message/WAKE#, 
ExtFmt-, EETLPPrefix-
                         EmergencyPowerReduction Not Supported, 
EmergencyPowerReductionInit-
                         FRS-, TPHComp-, ExtTPHComp-
                         AtomicOpsCap: 32bit- 64bit- 128bitCAS-
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, 
OBFF Disabled
                         AtomicOpsCtl: ReqEn-
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, 
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB, 
EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-, 
LinkEqualizationRequest-
        Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
                Vector table: BAR=4 offset=00000000
                PBA: BAR=4 offset=00000800
        Capabilities: [100 v2] Advanced Error Reporting
                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr-
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr+
                AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- 
ECRCChkCap+ ECRCChkEn-
                        MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
                HeaderLog: 00000000 00000000 00000000 00000000
        Capabilities: [140 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
                        Status: NegoPending- InProgress-
        Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
        Capabilities: [170 v1] Latency Tolerance Reporting
                Max snoop latency: 3145728ns
                Max no snoop latency: 3145728ns
        Capabilities: [178 v1] L1 PM Substates
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ 
L1_PM_Substates+
                          PortCommonModeRestoreTime=150us PortTPowerOnTime=150us
                L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
                           T_CommonMode=0us LTR1.2_Threshold=81920ns
                L1SubCtl2: T_PwrOn=150us
        Kernel driver in use: r8169
        Kernel modules: r8169


Working system:

01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 07)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI 
Express Gigabit Ethernet Controller
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 19
        Region 0: I/O ports at e000 [size=256]
        Region 2: Memory at dfe00000 (64-bit, non-prefetchable) [size=4K]
        Region 4: Memory at 2ffff00000 (64-bit, prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 01
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, 
L1 <64us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- 
SlotPowerLimit 10.000W
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ 
TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit 
Latency L0s unlimited, L1 <64us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, 
NROPrPrP-, LTR-
                         10BitTagComp-, 10BitTagReq-, OBFF Not Supported, 
ExtFmt-, EETLPPrefix-
                         EmergencyPowerReduction Not Supported, 
EmergencyPowerReductionInit-
                         FRS-, TPHComp-, ExtTPHComp-
                         AtomicOpsCap: 32bit- 64bit- 128bitCAS-
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, 
OBFF Disabled
                         AtomicOpsCtl: ReqEn-
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, 
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB, 
EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-, 
LinkEqualizationRequest-
        Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
                Vector table: BAR=4 offset=00000000
                PBA: BAR=4 offset=00000800
        Capabilities: [d0] Vital Product Data
pcilib: sysfs_read_vpd: read failed: Input/output error
                Not readable
        Capabilities: [100 v1] Advanced Error Reporting
                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr-
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr+
                AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- 
ECRCChkCap+ ECRCChkEn-
                        MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
                HeaderLog: 00000000 00000000 00000000 00000000
        Capabilities: [140 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
                        Status: NegoPending- InProgress-
        Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
        Kernel driver in use: r8169
        Kernel modules: r8169


The diffs show I have a more recent chip in the broken system (Working has Rev 
7, Broken has Rev 15). There are some other differences. As mentioned in an 
earlier comment it's only the broken system that says it has L1 PM Substates. 
Here is the complete diff.

--- lspci-working       2020-07-16 13:59:01.156191723 -0700
+++ lspci-broken        2020-07-16 13:58:02.344788308 -0700
@@ -1,12 +1,12 @@
-01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 07)
+01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 15)
         Subsystem: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI 
Express Gigabit Ethernet Controller
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
         Latency: 0, Cache Line Size: 64 bytes
-        Interrupt: pin A routed to IRQ 19
-        Region 0: I/O ports at e000 [size=256]
-        Region 2: Memory at dfe00000 (64-bit, non-prefetchable) [size=4K]
-        Region 4: Memory at 2ffff00000 (64-bit, prefetchable) [size=16K]
+        Interrupt: pin A routed to IRQ 18
+        Region 0: I/O ports at 3000 [size=256]
+        Region 2: Memory at a1204000 (64-bit, non-prefetchable) [size=4K]
+        Region 4: Memory at a1200000 (64-bit, non-prefetchable) [size=16K]
         Capabilities: [40] Power Management version 3
                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                 Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
@@ -17,20 +17,20 @@
                         ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- 
SlotPowerLimit 10.000W
                 DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
-                        MaxPayload 128 bytes, MaxReadReq 512 bytes
+                        MaxPayload 128 bytes, MaxReadReq 4096 bytes
                 DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ 
TransPend-
                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit 
Latency L0s unlimited, L1 <64us
-                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
+                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                 LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
-                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
+                        ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
                 LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                         TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
-                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, 
NROPrPrP-, LTR-
-                         10BitTagComp-, 10BitTagReq-, OBFF Not Supported, 
ExtFmt-, EETLPPrefix-
+                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, 
NROPrPrP-, LTR+
+                         10BitTagComp-, 10BitTagReq-, OBFF Via message/WAKE#, 
ExtFmt-, EETLPPrefix-
                          EmergencyPowerReduction Not Supported, 
EmergencyPowerReductionInit-
                          FRS-, TPHComp-, ExtTPHComp-
                          AtomicOpsCap: 32bit- 64bit- 128bitCAS-
-                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, 
OBFF Disabled
+                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, 
OBFF Disabled
                          AtomicOpsCtl: ReqEn-
                 LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                          Transmit Margin: Normal Operating Range, 
EnterModifiedCompliance- ComplianceSOS-
@@ -40,10 +40,7 @@
         Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
                 Vector table: BAR=4 offset=00000000
                 PBA: BAR=4 offset=00000800
-        Capabilities: [d0] Vital Product Data
-pcilib: sysfs_read_vpd: read failed: Input/output error
-                Not readable
-        Capabilities: [100 v1] Advanced Error Reporting
+        Capabilities: [100 v2] Advanced Error Reporting
                 UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                 UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                 UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
@@ -62,5 +59,14 @@
                         Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
                         Status: NegoPending- InProgress-
         Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
+        Capabilities: [170 v1] Latency Tolerance Reporting
+                Max snoop latency: 3145728ns
+                Max no snoop latency: 3145728ns
+        Capabilities: [178 v1] L1 PM Substates
+                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ 
L1_PM_Substates+
+                          PortCommonModeRestoreTime=150us 
PortTPowerOnTime=150us
+                L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
+                           T_CommonMode=0us LTR1.2_Threshold=81920ns
+                L1SubCtl2: T_PwrOn=150us
         Kernel driver in use: r8169
         Kernel modules: r8169

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Title:
  ubuntu 20.4 - retransmitts with r8169

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