I would not worry too much just yet. it should get through via Software Updater eventually, just check for updates in next few days. There have been reports of heavy server burden in past few days, which may be a factor.
Is your update source set to "Main Server"?
Thank you for your fast reply. Yes it's set to main. On three other devices, the upgrade was successfully. Which kernel version is the current one for 18.1 ?
Thinking the device is already on 18.1 but /etc/lsb-release is not updated. Is there any other hint to very if OS 18.1 is already installed instead of /etc/lsb-release and hostnamectl ? After newly upgrade the kernel version is vmlinuz-6.17.0-22-generic
You wrote that your software & updates app is set to main server, but your terminal output of post #7 doesn't show that (your downloads come from the charite in Berlin). I would first try to set it to main server and then update the software sources.
