I'm relatively new to Ubuntu, so I have little idea how to proceed.
I have an old HP system that i installed ubuntu on.
It has a network card, which should be running at 1000Mbs, but the system caps it at 100Mbs. I assume it's driver related.
So I think I need to know how to install the driver. I have no idea where to get it. I've seen various online references, but nothing seemed recent (at least 5 yrs old for many posts) and exactly on target with what I need.
I know the nic is a Realtek RTL8161
lspci | grep -i net
tells me it's a Realtek RTL8111/8168/8411 PCI Gigabit Ethernet Controller
sudo dmesg | grep r816 yields:
[ 2.441706] r8169 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 2.457555] r8169 0000:04:00.0 eth0: RTL8168gu/8111gu, c0:7c:d1:ff:4a:bf, XID 509, IRQ 127
[ 2.457560] r8169 0000:04:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
[ 2.458677] r8169 0000:04:00.0 enp4s0: renamed from eth0
[ 53.491489] Generic FE-GE Realtek PHY r8169-0-400:00: attached PHY driver (mii_bushy_addr=r8169-0-400:00, irq=MAC)
[ 53.675501] r8169 0000:04:00.0 enp4s0: Link is Down
[ 56.450902] r8169 0000:04:00.0 enp4s0: Link is Up - 100Mbps/Full - flow control off
thank you