Developus's questions

I have created Ubuntu 20.04 VM on my Hyper-V. I added there 2 network switches:

• external for internet connection
• private for isolated network

The problem is that this VM cannot connect with private network. eth1 is a private network and is all the time in Connecting status (aslo notification "activation of network connection failed" is shown) eth0 is normal internet switch

It is a little bit weird that this connection does not work and I cannot create isolated network between Ubuntu and other machines. can you help me with that?

I have a simple rest server in Scala. Run this project via intellij on localhost:8080. I tried to send POST or GET request into this server via postman and curl, but it cannot connect with it, don't know why. I pinged localhost and it answer, but localhost:8080 where the app runs only loading and nothing more. I run intellij and start my server (scala, cats, Blaze). Everything works correctly yesterday, but today it's not. I looked into intellij logs, and they look like good:

2019-04-21 19:29:08,912 [14101080]   INFO - ij.compiler.impl.CompileDriver - COMPILATION STARTED (BUILD PROCESS) 
2019-04-21 19:29:08,919 [14101087]   INFO - j.compiler.server.BuildManager - Using preloaded build process to compile /home/project 
2019-04-21 19:29:11,565 [14103733]   INFO - lij.compiler.impl.CompilerUtil -    COMPILATION FINISHED (BUILD PROCESS); Errors: 0; warnings: 0 took 2662 ms: 0 min 2sec 
2019-04-21 19:29:11,565 [14103733]   INFO - s.CompilerReferenceServiceBase - backward reference index reader doesn't exist 
2019-04-21 19:29:12,358 [14104526]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stdout]: Build process started. Classpath: /home/intellij/idea-IU-183.5912.21/lib/jps-launcher.jar:/usr/lib/jvm/java-1.11.0-openjdk-amd64/lib/tools.jar:/home/intellij/idea-IU-183.5912.21/lib/optimizedFileManager.jar 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Defaulting to no-operation (NOP) logger implementation 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: An illegal reflective access operation has occurred 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Illegal reflective access by com.google.protobuf.UnsafeUtil (file:/home/intellij/idea-IU-183.5912.21/lib/protobuf-java-3.4.0.jar) to field java.nio.Buffer.address 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Please consider reporting this to the maintainers of com.google.protobuf.UnsafeUtil 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: All illegal access operations will be denied in a future release 

Everything builds well. I don't know where the problem could be. I also tried to turn on proxy in postman but it did not help. Cleared also cache in intellij, nothing help. I'm using newest Ubuntu. Does anyone had same problem and know how to solve it? Maybe it is a stupid question but I really don't have any idea what could happend.

EDIT I ckecked if something else using port 8080 with this command: netstat -tulpn | grep 8080, but I only got one result:

tcp6 0 0 127.0.0.1:8080 :::*LISTEN 18125/java. It looks like only my running app is using this port.

I have a strange problem with Ubuntu. The space od my disk is eaten by system, probably. I have a disk separated into 3 areas - boot, exchange and free space for data. The sizes are 60GB, 16GB and 180GB. I feel the disk do not work fluency. The problem is connected with boot part - Normally I should have there 40GB of free space and after boot computer every day I have it, butafter few hours this space is smaller (currenlty 26GB of free space) and I do not know why. I dont install any programs, I just surf internet or use intellij - thats all. And free space is smaller. This is my output from df -h:

A you can see /dev/sda1 is the problem - it take more space all the time.

I have tried to do all thigs I know: clean, autoclean, clear logs and also used BleachBit - nothing helped. But after restart I have againa 40GB of free space which is reducing by the time I'm using system. What could be a source of this problem and how to repair it?

EDIT:

After installed ncdu, I got this info:

 8,9 GiB [##########] /var                                                                  
    4,2 GiB [####      ] /usr
  793,3 MiB [          ] /lib
  723,3 MiB [          ] /opt
  137,7 MiB [          ] /boot
   14,7 MiB [          ] /etc
   12,2 MiB [          ] /bin
   11,0 MiB [          ] /sbin
   88,0 KiB [          ] /tmp
   56,0 KiB [          ] /snap
   48,0 KiB [          ] /root
e  16,0 KiB [          ] /lost+found

Looks like var folder is too big. Go deeper:

5,8 GiB [##########] /gdm3                                                                 
    2,3 GiB [####      ] /snapd
  323,2 MiB [          ] /mongodb
  191,8 MiB [          ] /apt
   73,5 MiB [          ] /dpkg

Gdm3 is very big and its logs:

/var/lib/gdm3/.local/share/xorg 
                         /..                                                                   
    3,6 GiB [##########]  Xorg.0.log
    2,2 GiB [#####     ]  Xorg.0.log.old

How can I fix it?