Errors from Changing Ubuntu User Name

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

I am seeing strange behaviour when I change the ubuntu user name a home directory.

To change username, I use:

sudo usermod -l newuser ubuntu

To change home-folder, I use

sudo usermod -d /home/newuser -m newuser

.

This does make the expected changes but the ethernet stops working.

Only the “lo” network connection is shown by

ifconfig

as

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:360 (360.0 B)  TX bytes:360 (360.0 B)

I checked the

/etc/group

file after using usermod to change the user name, all ubuntu references where changed to newuser.

If I do the process in reverse, ifconfig provides

dummy0    Link encap:Ethernet  HWaddr 92:39:97:d4:13:0d  
          inet6 addr: fe80::9039:97ff:fed4:130d/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:2604 (2.6 KB)

eth0      Link encap:Ethernet  HWaddr 00:04:4b:8c:97:e1  
          inet addr:10.58.44.102  Bcast:10.58.63.255  Mask:255.255.224.0
          inet6 addr: fe80::204:4bff:fe8c:97e1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1259 errors:0 dropped:0 overruns:0 frame:0
          TX packets:610 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:168474 (168.4 KB)  TX bytes:25114099 (25.1 MB)
          Interrupt:42 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:360 (360.0 B)  TX bytes:360 (360.0 B)

wlan0     Link encap:Ethernet  HWaddr 00:04:4b:8c:97:df  
          inet6 addr: fe80::204:4bff:fe8c:97df/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:3384 (3.3 KB)

and I have connection to the internet.

There are other strange behaviours that occur under different users also. For example other users do not run tensorflow as fast.

Any suggestions?

2

Just a thought on this since I haven’t changed user ubuntu…ubuntu and anyone accessing the GPU will need to be in group “video”. If you examine file “/etc/group” before and after your change, do all of the supplemental groups also change? If not, then this would explain part of the issue.