Tag: Ubuntu 24.04

Upgrade to Ubuntu 24.04 – whoops I’ve lost my network connections

I used remote access to upgrade my Ubuntu server. After the upgrade I could not connect over Ethernet. ( I could not access over Wi-Fi, but that was a different problem).

If I pinged from either end, it did not connect.

On my server, the network server for the network connection wired, did not have a MAC address specified. I used the pull down and selected it. I do not know if this is relevant.

My laptop had address 10.1.0.2, and the server had address 10.10.0.3.

On the server the command

ip addr

gave

2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 ...
    inet 10.1.0.3/24 brd 10.1.0.255 scope global noprefixroute eno1

I used the command

sudo ip route add 10.1.0.2 dev eno1

to define the route, and connectivity was temporarily restored. I could ping from either machine.

Digging deeper

The command

grep -i warn /var/log/syslog

gave

NetworkManager[1457]: <warn>  [...] keyfile: load: "/etc/NetworkManager/system-connections/eno1": failed to load connection: File permissions (100604) are insecure

ls -ltr /etc/NetworkManager/system-connections/eno1

gave

-rw----r-- 1 root root 376 Oct 21 2022 /etc/NetworkManager/system-connections/eno1

Where file permission xxx604 is -rw—-r–, which allows “other” to read the file

The command

sudo chmod o-r /etc/NetworkManager/system-connections/*

removes the “other” read permission.The next reboot gave me connectivity back.

Lessons learned

After doing an upgraded, (or perhaps once a week) display the syslog for warn and error and resolve any problems.

Ubuntu 24.04 upgrade. tp-link wifi did not work

I upgraded from 22.04 to 24.04 and my plug-in Wi-Fi tp-link device did not work.

What device do I have ?

The command

lsusb

gave me

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 17ef:4515 Lenovo Lenovo Portable HDD
Bus 001 Device 003: ID 2357:0109 TP-Link TL-WN823N v2/v3 [Realtek RTL8192EU]

but the command 

sudo lshw -c network

did not show me any wireless definitions.

Fixing the problem

I followed the instructions in https://github.com/Mange/rtl8192eu-linux-driver.

The files you need may already be on your machine for earlier versions of Ubuntu, you may not need to download anything.

Because my server had no Wi-Fi connection, I used git to download the latest code to my laptop onto a USB device, and then used the USB device on the server machine. You may not need to do this.

I used the instructions to

  • sudo dkms uninstall rtl8192eu/1.0 to uninstall the driver and
  • sudo dkms remove rtl8192eu/1.0 –all to delete the drive
  • reboot
  • then followed the instructions.

Without the uninstall and remove the install did not activate the drivers.