Public bug reported:

Subunit 18.04 LTS
System will not boot.

I updated graphics drivers I think erroneously, then received the
underrun errors and created a swap partition by accident following a fix
for a similar error as was having trouble booting crypt.  I commented
out the swap and turned off swap and have updated my drivers and purged
previous.  I can access terminal, yet still cannot boot due to the
undercut.  I think I need to create a .conf file for the graphics
drivers.

CPU pipe B FIFO underrun

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
Date: Wed Jul  4 03:45:23 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e12] 
(rev 03) (prog-if 00 [VGA controller])
   Subsystem: Lenovo ThinkCentre M6258 [17aa:3048]
   Subsystem: Lenovo 4 Series Chipset Integrated Graphics Controller [17aa:3048]
InstallationDate: Installed on 2018-01-25 (160 days ago)
InstallationMedia: It
MachineType: LENOVO 7220RY8
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-10-generic 
root=/dev/mapper/it--vg-root ro quiet splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/07/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 5CKT77AUS
dmi.board.name: LENOVO
dmi.board.vendor: LENOVO
dmi.board.version: NONE
dmi.chassis.asset.tag: ������������������������
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.version: NONE
dmi.modalias: 
dmi:bvnLENOVO:bvr5CKT77AUS:bd05/07/2012:svnLENOVO:pn7220RY8:pvrThinkCentreM58p:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE:
dmi.product.family: NONE
dmi.product.name: 7220RY8
dmi.product.version: ThinkCentre M58p
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.92+git1806210630.7164ab~oibaf~b
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2~git1807040730.45f9d5~oibaf~b
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2~git1807040730.45f9d5~oibaf~b
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Wed Jul  4 03:33:45 2018
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.6-1ubuntu4
xserver.video_driver: modeset

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages ubuntu

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https://bugs.launchpad.net/bugs/1780077

Title:
  FIFO underrun error

Status in xorg package in Ubuntu:
  New

Bug description:
  Subunit 18.04 LTS
  System will not boot.

  I updated graphics drivers I think erroneously, then received the
  underrun errors and created a swap partition by accident following a
  fix for a similar error as was having trouble booting crypt.  I
  commented out the swap and turned off swap and have updated my drivers
  and purged previous.  I can access terminal, yet still cannot boot due
  to the undercut.  I think I need to create a .conf file for the
  graphics drivers.

  CPU pipe B FIFO underrun

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Wed Jul  4 03:45:23 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: I just need to know a workaround
  GraphicsCard:
   Intel Corporation 4 Series Chipset Integrated Graphics Controller 
[8086:2e12] (rev 03) (prog-if 00 [VGA controller])
     Subsystem: Lenovo ThinkCentre M6258 [17aa:3048]
     Subsystem: Lenovo 4 Series Chipset Integrated Graphics Controller 
[17aa:3048]
  InstallationDate: Installed on 2018-01-25 (160 days ago)
  InstallationMedia: It
  MachineType: LENOVO 7220RY8
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-10-generic 
root=/dev/mapper/it--vg-root ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/07/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5CKT77AUS
  dmi.board.name: LENOVO
  dmi.board.vendor: LENOVO
  dmi.board.version: NONE
  dmi.chassis.asset.tag: ������������������������
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: NONE
  dmi.modalias: 
dmi:bvnLENOVO:bvr5CKT77AUS:bd05/07/2012:svnLENOVO:pn7220RY8:pvrThinkCentreM58p:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE:
  dmi.product.family: NONE
  dmi.product.name: 7220RY8
  dmi.product.version: ThinkCentre M58p
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
  version.libdrm2: libdrm2 2.4.92+git1806210630.7164ab~oibaf~b
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2~git1807040730.45f9d5~oibaf~b
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2~git1807040730.45f9d5~oibaf~b
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
  xserver.bootTime: Wed Jul  4 03:33:45 2018
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.6-1ubuntu4
  xserver.video_driver: modeset

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