Alex Luya's questions

currently,lspci gives:

.....
00:14.3 Network controller: Intel Corporation Cannon Lake PCH CNVi WiFi (rev 10)
 Corporation HM470 Chipset LPC/eSPI Controller (rev 10)
3c:00.0 Ethernet controller: Qualcomm Atheros Killer E2500 Gigabit Ethernet Controller (rev 10)
.....

As you can,both ethernet and wifi got listed,but only wifi works.If disabling wifi,I got:

As we can see,no ethernet got listed.and before upgrading,after disable wifi entry like "Ethernet ..." will be in this list.After running "lshw -c network",these got printed out:

[sudo] password for alex: 
  *-network                 
       description: Wireless interface
       product: Cannon Lake PCH CNVi WiFi
       vendor: Intel Corporation
       physical id: 14.3
       bus info: pci@0000:00:14.3
       logical name: wlo1
       version: 10
       serial: 64:5d:86:ba:09:af
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.15.0-40-generic firmware=46.fae53a8b.0 9000-pu-b0-jf-b0- ip=192.168.8.119 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:16 memory:ad414000-ad417fff
  *-network
       description: Ethernet interface
       product: Killer E2500 Gigabit Ethernet Controller
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:3c:00.0
       logical name: enp60s0
       version: 10
       serial: 30:9c:23:ff:fb:a4
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=alx driverversion=5.15.0-40-generic duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:16 memory:ad200000-ad23ffff ioport:3000(size=128)

It seems the ehternet card of Killer E2500 got listed.Question is

How to make ethernet work again?

I got datasets from Cell Tracking Challenge for deep learning task, but tif images (label images) are showing complete black. Geeqie, Gnome image viewer, and Shutter have been tried.

My configuration is:

Ubuntu 18.04
Nvidia Driver 430  
libtiff.so.5.3.0

identify -verbose man_seg002.tif gives:

Image: man_seg002.tif
  Format: TIFF (Tagged Image File Format)
  Mime type: image/tiff
  Class: DirectClass
  Geometry: 512x512+0+0
  Resolution: 52631.8x52631.8
  Print size: 0.00972795x0.00972795
  Units: PixelsPerCentimeter
  Type: Grayscale
  Base type: Grayscale
  Endianess: LSB
  Colorspace: Gray
  Depth: 16-bit
  Channel depth:
    gray: 16-bit
  Channel statistics:
    Pixels: 262144
    Gray:
      min: 0 (0)
      max: 10 (0.00015259)
      mean: 1.94572 (2.96899e-05)
      standard deviation: 2.96685 (4.52713e-05)
      kurtosis: 0.326432
      skewness: 1.30041
      entropy: 0.646021
  Colors: 11
  Histogram:
    160474: (    0,    0,    0) #000000000000 gray(0)
     11764: (    1,    1,    1) #000100010001 gray(0%)
     11548: (    2,    2,    2) #000200020002 gray(0%)
     11724: (    3,    3,    3) #000300030003 gray(0%)
      9411: (    4,    4,    4) #000400040004 gray(0%)
     13268: (    5,    5,    5) #000500050005 gray(0%)
     13211: (    6,    6,    6) #000600060006 gray(0%)
      8112: (    7,    7,    7) #000700070007 gray(0%)
      9023: (    8,    8,    8) #000800080008 gray(0%)
      8280: (    9,    9,    9) #000900090009 gray(0%)
      5329: (   10,   10,   10) #000A000A000A gray(0%)
  Rendering intent: Undefined
  Gamma: 0.454545
  Background color: gray(255)
  Border color: gray(223)
  Matte color: gray(189)
  Transparent color: gray(0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 512x512+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: LZW
  Orientation: TopLeft
  Properties:
    date:create: 2019-09-22T10:10:54+08:00
    date:modify: 2013-11-16T07:41:22+08:00
    signature: 20c7b0ccb92bfd0b783d88426b9955ac7ddb3e25b626fd3b22927cdcecd15788
    tiff:alpha: unspecified
    tiff:endian: lsb
    tiff:photometric: min-is-black
    tiff:rows-per-strip: 8
  Artifacts:
    filename: man_seg002.tif
    verbose: true
  Tainted: False
  Filesize: 21.7KB
  Number pixels: 262K
  Pixels per second: 26.21MB
  User time: 0.010u
  Elapsed time: 0:01.010
  Version: ImageMagick 6.9.7-4 Q16 x86_64 20170114 http://www.imagemagick.org

I am using Ubuntu 14.04 64 bit desktop,and updating worked fine before, but suddenly it doesn't (it is a long time from last updating, so I can't ensure what operation leads this problem).

As you can see, all keys exist already, but I still got a bunch of key missing errors, and I doubt it is a server error, so switched "download from" server, but no luck, then I tried to remove all keys manually and run:

sudo rm /var/lib/apt/lists/* -vf

Then:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com [key]

To add all keys in error message, but still get this error, why?