I installed the following deb files:

linux-headers-4.13.0-19_4.13.0-19.22_all.deb
linux-headers-4.13.0-19-generic_4.13.0-19.22_amd64.deb
linux-image-4.13.0-19-generic_4.13.0-19.22_amd64.deb
linux-image-extra-4.13.0-19-generic_4.13.0-19.22_amd64.deb

Now I'm running

$ uname -a
Linux bionic 4.13.0-19-generic #22-Ubuntu SMP Mon Dec 4 11:58:07 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux

and the bug IS STILL present.

Any other idea?

BTW, perhaps this might help:

$ lsmod
Module                  Size  Used by
ccm                    20480  3
rfcomm                 77824  4
bnep                   20480  2
snd_hda_codec_hdmi     49152  1
snd_hda_codec_realtek    94208  1
snd_hda_codec_generic    73728  1 snd_hda_codec_realtek
intel_rapl             20480  0
x86_pkg_temp_thermal    16384  0
intel_powerclamp       16384  0
coretemp               16384  0
kvm_intel             200704  0
hid_generic            16384  0
joydev                 20480  0
kvm                   581632  1 kvm_intel
irqbypass              16384  1 kvm
crct10dif_pclmul       16384  0
crc32_pclmul           16384  0
ghash_clmulni_intel    16384  0
pcbc                   16384  0
dell_laptop            20480  0
snd_hda_intel          40960  3
aesni_intel           188416  2
snd_hda_codec         126976  4 
snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
aes_x86_64             20480  1 aesni_intel
crypto_simd            16384  1 aesni_intel
snd_hda_core           81920  5 
snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hwdep              20480  1 snd_hda_codec
glue_helper            16384  1 aesni_intel
snd_pcm                98304  4 
snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
cryptd                 24576  3 crypto_simd,ghash_clmulni_intel,aesni_intel
intel_cstate           20480  0
intel_rapl_perf        16384  0
arc4                   16384  2
snd_seq_midi           16384  0
iwldvm                229376  0
snd_seq_midi_event     16384  1 snd_seq_midi
mac80211              778240  1 iwldvm
snd_rawmidi            32768  1 snd_seq_midi
btusb                  45056  0
btrtl                  16384  1 btusb
wmi_bmof               16384  0
snd_seq                65536  2 snd_seq_midi_event,snd_seq_midi
btbcm                  16384  1 btusb
iwlwifi               249856  1 iwldvm
input_leds             16384  0
dell_wmi               16384  0
dell_smbios            16384  2 dell_wmi,dell_laptop
dcdbas                 16384  1 dell_smbios
sparse_keymap          16384  1 dell_wmi
btintel                16384  1 btusb
serio_raw              16384  0
bluetooth             540672  31 btrtl,btintel,bnep,btbcm,rfcomm,btusb
snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_midi
uvcvideo               90112  0
snd_timer              32768  2 snd_seq,snd_pcm
videobuf2_vmalloc      16384  1 uvcvideo
usbhid                 49152  0
videobuf2_memops       16384  1 videobuf2_vmalloc
hid                   118784  2 hid_generic,usbhid
ecdh_generic           24576  1 bluetooth
snd                    81920  17 
snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_seq_device,snd_hda_codec_realtek,snd_pcm
videobuf2_v4l2         24576  1 uvcvideo
cfg80211              610304  3 iwlwifi,mac80211,iwldvm
acpi_als               16384  0
videobuf2_core         40960  2 uvcvideo,videobuf2_v4l2
soundcore              16384  1 snd
mei_me                 40960  0
lpc_ich                24576  0
shpchp                 36864  0
kfifo_buf              16384  1 acpi_als
mei                    98304  1 mei_me
videodev              176128  3 uvcvideo,videobuf2_core,videobuf2_v4l2
industrialio           69632  2 acpi_als,kfifo_buf
intel_smartconnect     16384  0
media                  40960  2 uvcvideo,videodev
mac_hid                16384  0
sch_fq_codel           20480  5
parport_pc             32768  0
ppdev                  20480  0
lp                     20480  0
parport                49152  3 lp,parport_pc,ppdev
ip_tables              24576  0
x_tables               40960  1 ip_tables
autofs4                40960  2
i915                 1798144  11
i2c_algo_bit           16384  1 i915
drm_kms_helper        167936  1 i915
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
ahci                   36864  4
fb_sys_fops            16384  1 drm_kms_helper
psmouse               147456  0
drm                   356352  5 i915,drm_kms_helper
libahci                32768  1 ahci
wmi                    24576  2 dell_wmi,wmi_bmof
video                  40960  3 dell_wmi,dell_laptop,i915

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which is subscribed to libinput in Ubuntu.
https://bugs.launchpad.net/bugs/1816947

Title:
  [Dell XPS L321X] Touchpad not working after last apt-get upgrade

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