This ls Linux Mint 18.2, 64-bit.The connection is working, but the network-manager in the system tray is greyed out and reports "no connection" on mouse hover. A single click shows "Wired" and "unmanaged" with choices Network Settings and Network Connections.
Clicking on Network Settings shows a dialog window with only the Proxy setting in it. Network Connections shows a wired connection, but what is shown is not what is active, e.g. the Network Connections dialog shows a static IP address, but ifconfig reports a dynamic IP address.
Here's inxi -Fxz output:
I moved the SSD over to this system from another when it was LM 17.3. I lost network connectivity and then proceeded to make some changes; unfortunately, I don't remember what, but I did get networking going again with the result as described above. I have since upgraded to Linux Mint 18.2. The upgrade did not change the situation.
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System: Host: kwm-op390 Kernel: 4.10.0-38-generic x86_64 (64 bit gcc: 5.4.0) Desktop: Cinnamon 3.4.6 (Gtk 3.18.9-1ubuntu3.3) Distro: Linux Mint 18.2 Sonya Machine: System: Dell product: OptiPlex 390 v: 01 Mobo: Dell model: 0F6X5P v: A00 Bios: Dell v: A05 date: 02/09/2012 CPU: Quad core Intel Core i5-2400 (-MCP-) cache: 6144 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 24743 clock speeds: max: 3400 MHz 1: 1705 MHz 2: 1794 MHz 3: 1754 MHz 4: 1656 MHz Graphics: Card: Intel 2nd Generation Core Processor Family Integrated Graphics Controller bus-ID: 00:02.0 Display Server: X.Org 1.18.4 drivers: intel (unloaded: fbdev,vesa) Resolution: email@example.com GLX Renderer: Mesa DRI Intel Sandybridge Desktop GLX Version: 3.0 Mesa 17.0.7 Direct Rendering: Yes Audio: Card Intel 6 Series/C200 Series Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 Sound: Advanced Linux Sound Architecture v: k4.10.0-38-generic Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169 v: 2.3LK-NAPI port: 2000 bus-ID: 03:00.0 IF: eth1 state: up speed: 1000 Mbps duplex: full mac: <filter> Drives: HDD Total Size: 1256.3GB (36.7% used) ID-1: /dev/sda model: Crucial_CT256MX1 size: 256.1GB temp: 34C ID-2: /dev/sdb model: WDC_WD10JPLX size: 1000.2GB temp: 28C Partition: ID-1: / size: 231G used: 13G (6%) fs: ext4 dev: /dev/sda1 ID-2: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sda5 RAID: No RAID devices: /proc/mdstat, md_mod kernel module present Sensors: System Temperatures: cpu: 37.0C mobo: N/A Fan Speeds (in rpm): cpu: N/A Info: Processes: 235 Uptime: 56 min Memory: 2796.0/7876.9MB Init: systemd runlevel: 5 Gcc sys: 5.4.0 Client: Shell (bash 4.3.481) inxi: 2.2.35
I'd like to get things right again, but I don't know how.