Ukuu and installed kernels

[Patrice]

So many kernel, how to remove most of them?

The second letter at start of each line of output is the status. ‘i’ means installed. ‘c’ means configuration files remain (but kernel has been removed). So, most of the items you list here are kernels already removed, but the configuration files are still there. (Your command would not list any old ‘linux-signed-image’ files and and ‘linux-header’ files which might also be installed, so don’t forget those.) To remove with Synaptic Package Manager always select ‘mark for complete removal’ as …

Spyder have answered my question maybe it might help you as well in your quest