sudo su
fwupdmgr refresh
fwupdmgr get-updates
fwupdmgr update -v
or download the firmware update from dell .exe file and put into /boot/efi
reboot press F12 ans choose firmare upgrade
root@ubuntu:/boot/efi# ls
EFI XPS_9370_1.5.1.exe
Firmware upgrade Dell XPS 13 Ubuntu
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