Problem

Ethernet RTL8111/8168/8411 is not recognized by kernel 4.4.39-rt50. Running ifconfig shows only the other network interface and lo.

Solution

It turns out the realtime kernel does not have module r8168. Instead it contains r8169. However, by installing r8168-dkms the r8169 module is …

Today I encountered a weird problem when using Eigen library with keyword auto. The scenario is as follows:

Eigen::Affine3d aff;
// aff is assigned with a valid value ...

auto r = aff.rotation();
auto res = r * r;

In the end, the result variable res contains a 3x3 matrix with only zero values, no …

• Disable WIFI and plug in an internet cable to your laptop so that your Ubuntu is connect to a wired internet and wireless is disabled.
• Go to Network Icon on top panel -> Edit Connections …, then click the “Add” button in the pop-up window.
• Choose Wi-Fi from the drop-down menu when …