I made a test with the standard 4.15.0-62-generic kernel. The result is
the same, and I add that the laptop takes 3-4 minutes to pass from the
login screen to a ready desktop.
I attach a dmesg text obtained with the older kernel.
** Attachment added: "dmesg_4.15.txt"
https://bugs.launchpad.ne
Public bug reported:
I performed a fresh install of Ubuntu 18.04.3 ina Dell Laptop Vostro 1400 with
an intel core 2 duo 9500T cpu.
Both during the boot from the USB installation key and during every subsequent
boot after installation, the boot is very slow despite the SSD (with Linux mint
18.3