Установка проблемы BleachBit

У меня есть ubuntu 18.04 LTS, и я желаю получить BleachBit и когда я пробую через командную строку, я получаю это сообщение об ошибке:

 Preconfiguring packages ...
(Reading database ... 168709 files and directories currently installed.)
Removing linux-image-4.15.0-20-generic (4.15.0-20.21) ...
/etc/kernel/postrm.d/initramfs-tools:
update-initramfs: Deleting /boot/initrd.img-4.15.0-20-generic
/etc/kernel/postrm.d/zz-update-grub:
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE) 
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE) 
(EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE) 
(EE) Server terminated with error (1). Closing log file.
run-parts: /etc/kernel/postrm.d/zz-update-grub exited with return code 1
dpkg: error processing package linux-image-4.15.0-20-generic (--remove):
 installed linux-image-4.15.0-20-generic package post-removal script subprocess returned error exit status 1
Errors were encountered while processing:
 linux-image-4.15.0-20-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)

Это - то, что находится в Xorg.0.log:

[  2545.601] _XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
[  2545.602] _XSERVTransMakeAllCOTSServerListeners: server already running
[  2545.602] (EE) 
Fatal server error:
[  2545.603] (EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE) 
[  2545.603] (EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
[  2545.604] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  2545.604] (EE) 
[  2545.604] (EE) Server terminated with error (1). Closing log file.

Я использовал sudo service lightdm stop пытаться уничтожить xserver и было "Отказавшим для остановки lightdm.service: Единица lightdm.service не загруженный".

Когда я пытаюсь установить с веб-сайта, я получаю это сообщение об ошибке в уведомлении: "Не удалось установить BleachBit: Ошибка при установке пакета: установленный linux-image-4.15.0-20-generic сценарий постудаления пакета подобрабатывает возвращенный ошибочный статус выхода 1 дюйм

Таким образом, я в замешательстве здесь. Я не нашел ничего, что могло помочь мне, когда я искал сообщения об ошибках. У меня также была эта та же ошибка командной строки при попытке установить ffmpeg также. Я был бы очень признателен за любую справку с этим.Спасибо.

Править: Я перешел к wiki.x.org к https://www.x.org/wiki/FAQErrorMessages/, и он сказал для попытки netstat -ln но команда netstat не была найдена, и я получил то же сообщение об ошибке при попытке установить ее.

EDIT2: cat /etc/apt/sources.list возвраты:

# deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic universe
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner

deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
deb http://archive.canonical.com/ bionic partner
# deb-src http://archive.canonical.com/ bionic partner
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse

EDIT3: sudo dpkg --configure -a && sudo apt update --fix-missing -y && sudo apt install -f -y && sudo apt full-upgrade -y возвраты:

Setting up linux-image-4.15.0-29-generic (4.15.0-29.31) ...
Processing triggers for linux-image-4.15.0-29-generic (4.15.0-29.31) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.15.0-29-generic
/etc/kernel/postinst.d/zz-update-grub:
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
(EE) 
Fatal server error:
(EE) Cannot establish any listening sockets - Make sure an X server isn't already running(EE) 
(EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE) 
(EE) Server terminated with error (1). Closing log file.
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
dpkg: error processing package linux-image-4.15.0-29-generic (--configure):
 installed linux-image-4.15.0-29-generic package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 linux-image-4.15.0-29-generic

EDIT4: вывод cat /etc/default/grub :

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=1"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
X
sudo update-grub
X

X

sudo update-grub