KDE's KSysGuard is displaying the same problem and I found out that it's showing the sum of network traffic on all available interfaces (including both the normal WLAN's wlo0 and VPN's ppp0), hence the doubling. I suspect GNOME System Monitor is doing the same thing.
** Attachment added: "ksysguard-traffic.png" https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/1076880/+attachment/4383208/+files/ksysguard-traffic.png -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-system-monitor in Ubuntu. https://bugs.launchpad.net/bugs/1076880 Title: network speed incorrectly reported in System Monitor using VPN To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/1076880/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs