package linux-image-4.15.0-23-generic 4.15.0-23.25 failed to install/upgrade: installed linux-image-4.15.0-23-generic package pre-removal script subprocess returned error exit status 1

[Christopher]

sudo apt-get remove linux-image-ex
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-image-ex

I'm trying to free up space in my hard drive and i got this error i was expecting to remove the selected image provided in the report and instead gotten this message
I am using 4.15.0-23-generic image
Description: Ubuntu 18.04 LTS
Release: 18.04

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-23-generic 4.15.0-23.25
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-generic x86_64
NonfreeKernelModules: snd_hda_codec_hdmi edac_mce_amd snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec wmi_bmof snd_hda_core k10temp shpchp mac_hid nouveau mxm_wmi pata_acpi firewire_ohci r8169 firewire_core pata_atiixp i2c_piix4 wmi
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: gdm 1029 F.... pulseaudio
                      ghost 1451 F.... pulseaudio
 /dev/snd/controlC0: gdm 1029 F.... pulseaudio
                      ghost 1451 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Mon Jun 25 18:46:37 2018
ErrorMessage: installed linux-image-4.15.0-23-generic package pre-removal script subprocess returned error exit status 1
HibernationDevice: RESUME=UUID=ba74b561-39bb-4df6-900d-369614ad28a3
InstallationDate: Installed on 2018-06-24 (1 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
IwConfig:
 lo no wireless extensions.

 enp2s0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. GA-MA785GPMT-UD2H
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-23-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions: grub-pc 2.02-2ubuntu8
RfKill:

SourcePackage: linux
Title: package linux-image-4.15.0-23-generic 4.15.0-23.25 failed to install/upgrade: installed linux-image-4.15.0-23-generic package pre-removal script subprocess returned error exit status 1
UpgradeStatus: Upgraded to bionic on 2018-06-24 (1 days ago)
dmi.bios.date: 08/06/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F2
dmi.board.name: GA-MA785GPMT-UD2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd08/06/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA785GPMT-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA785GPMT-UD2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA785GPMT-UD2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

You may need to run the following from a terminal:

sudo apt-get install -f
sudo apt-get clean
sudo apt-get update

[Joseph Salisbury (jsalisbury)]

Also, linux-image-ex is not a valid package name. You can see the kernels you have install with:

sudo dpkg -l | grep linux-image