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I recently installed, then uninstalled Docker, using 

sudo apt install docker.io
, restarting, then 
sudo apt remove docker.io
on Linux Mint 20.1.

Since then (actually after the install), my network connection fails. I then used Timeshift on Linux Mint to restore my system to before the Docker install, but still the connection doesn’t work: "Activation of network connection failed" from the Network popup window.

I have read some posts about others who have lost network connection after Docker installed, but all the advice I have read is how to fix it with Docker installed, but I have it removed now, and want to get my network connection working.

My 

systemd-resolve --status
output:

Global
       LLMNR setting: no                  
MulticastDNS setting: no                  
  DNSOverTLS setting: no                  
      DNSSEC setting: no                  
    DNSSEC supported: no                  
          DNSSEC NTA: 10.in-addr.arpa     
                      16.172.in-addr.arpa 
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa 
                      18.172.in-addr.arpa 
                      19.172.in-addr.arpa 
                      20.172.in-addr.arpa 
                      21.172.in-addr.arpa 
                      22.172.in-addr.arpa 
                      23.172.in-addr.arpa 
                      24.172.in-addr.arpa 
                      25.172.in-addr.arpa 
                      26.172.in-addr.arpa 
                      27.172.in-addr.arpa 
                      28.172.in-addr.arpa 
                      29.172.in-addr.arpa 
                      30.172.in-addr.arpa 
                      31.172.in-addr.arpa 
                      corp                
                      d.f.ip6.arpa        
                      home                
                      internal            
                      intranet            
                      lan                 
                      local               
                      private             
                      test                
Link 2 (enp4s0)
      Current Scopes: none
DefaultRoute setting: no  
       LLMNR setting: yes 
MulticastDNS setting: no  
  DNSOverTLS setting: no  
      DNSSEC setting: no  
    DNSSEC supported: no

My 

ifconfig
output:

$ ifconfig 
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether b4:2e:99:94:68:10  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 4916  bytes 297761 (297.7 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4916  bytes 297761 (297.7 KB)

Any tips for what I can run to try debug this?

Anonymous Asked question May 14, 2021