** Description changed:

  [Impact]
  
  Upgrading apt version of lxd to snap version during do-release-upgrade
  failed.
  
- I attempted to update my ubuntu server 18.04 system to 18.10 as follows:
+ I attempted to update my ubuntu server 18.04 system to 18.10 as root:
  
  apt update
  apt dist-upgrade -y
  apt autoremove -y
  do-release-upgrade
  
  I have an existing LXD installed via apt, and running containers.
  
  It asked me which snap LXD to upgrade to, and I selected "latest".
  
  Console log:
  
- ==> Installing the LXD snap from the latest track for ubuntu-18.10            
                                                                                
                                                      
+ ==> Installing the LXD snap from the latest track for ubuntu-18.10
  error: cannot perform the following tasks:
  - Run install hook of "lxd" snap if present (run hook "install": cannot 
perform operation: mount /var/lib/snapd/hostfs/var/lib/lxd /var/lib/lxd -o 
nosuid,nodev,noexec,rbind,rslave: Permission denied)
  dpkg: error processing archive 
/tmp/apt-dpkg-install-gdCSiW/32-lxd_1%3a0.4_all.deb (--unpack):
-  new lxd package pre-installation script subprocess returned error exit 
status 1
+  new lxd package pre-installation script subprocess returned error exit 
status 1
  Traceback (most recent call last):
-                                     File 
"/usr/lib/python3/dist-packages/apt/cache.py", line 265, in __getitem__
-                                                                               
                                      rawpkg = self._cache[key]
-                                                                               
                                                               KeyError: 
'32-lxd'
+                                     File 
"/usr/lib/python3/dist-packages/apt/cache.py", line 265, in __getitem__
+                                                                               
                                      rawpkg = self._cache[key]
+                                                                               
                                                               KeyError: 
'32-lxd'
  
  During handling of the above exception, another exception occurred:
  
-               Traceback (most recent call last):
-                                                   File 
"/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 126, in _apt_pkg
-                                                                               
                                                             return 
self._cache()[package]
-                                                                               
                                                                                
            File "/usr/lib/python3/dist-packages/apt/cache.py", line 267, in 
__getitem__
-                                       raise KeyError('The cache has no 
package named %r' % key)
-                                                                               
                 KeyError: "The cache has no package named '32-lxd'"
+               Traceback (most recent call last):
+                                                   File 
"/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 126, in _apt_pkg
+                                                                               
                                                             return 
self._cache()[package]
+                                                                               
                                                                                
            File "/usr/lib/python3/dist-packages/apt/cache.py", line 267, in 
__getitem__
+                                       raise KeyError('The cache has no 
package named %r' % key)
+                                                                               
                 KeyError: "The cache has no package named '32-lxd'"
  
-                                                                               
                                                                    During 
handling of the above exception, another exception occurred:
-  
-  Traceback (most recent call last):
-                                      File "/usr/share/apport/package_hook", 
line 48, in <module>
-                                                                               
                      pr['SourcePackage'] = 
apport.packaging.get_source(options.package)
-                                                                               
                                                                                
          File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 
159, in get_source
-                                                if 
self._apt_pkg(package).installed:
-                                                                               
       File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 
128, in _apt_pkg
-                                                                               
                                                                                
                raise ValueError('package %s does not exist' % package)
-                  ValueError: package 32-lxd does not exist
-                                                           Preparing to unpack 
.../33-open-iscsi_2.0.874-5ubuntu9.1_amd64.deb ...
+ During handling of the above exception, another exception occurred:
+ 
+  Traceback (most recent call last):
+                                      File "/usr/share/apport/package_hook", 
line 48, in <module>
+                                                                               
                      pr['SourcePackage'] = 
apport.packaging.get_source(options.package)
+                                                                               
                                                                                
          File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 
159, in get_source
+                                                if 
self._apt_pkg(package).installed:
+                                                                               
       File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 
128, in _apt_pkg
+                                                                               
                                                                                
                raise ValueError('package %s does not exist' % package)
+                  ValueError: package 32-lxd does not exist
+                                                           Preparing to unpack 
.../33-open-iscsi_2.0.874-5ubuntu9.1_amd64.deb ...
  Unpacking open-iscsi (2.0.874-5ubuntu9.1) over (2.0.874-5ubuntu2.4) ...
  Preparing to unpack .../34-poppler-data_0.4.9-2_all.deb ...
  Unpacking poppler-data (0.4.9-2) over (0.4.8-2) ...
  Preparing to unpack .../35-tasksel-data_3.34ubuntu12_all.deb ...
  Unpacking tasksel-data (3.34ubuntu12) over (3.34ubuntu11) ...
  Preparing to unpack .../36-tasksel_3.34ubuntu12_all.deb ...
  Unpacking tasksel (3.34ubuntu12) over (3.34ubuntu11) ...
  Preparing to unpack .../37-libsepol1_2.8-1_amd64.deb ...
  Unpacking libsepol1:amd64 (2.8-1) over (2.7-1) ...
  Errors were encountered while processing:
-  /tmp/apt-dpkg-install-gdCSiW/32-lxd_1%3a0.4_all.deb
+  /tmp/apt-dpkg-install-gdCSiW/32-lxd_1%3a0.4_all.deb
  Exception during pm.DoInstall():  E:Sub-process /usr/bin/dpkg returned an 
error code (1)
  
  *** Send problem report to the developers?
  
- 
- There also appears to be a secondary bug in the error report collection 
software, causing it to process an illegal UTF-8 sequence:
+ There also appears to be a secondary bug in the error report collection
+ software, causing it to process an illegal UTF-8 sequence:
  
  *** Collecting problem information
  
  The collected information can be sent to the developers to improve the
  application. This might take a few minutes.
  .....ERROR: hook /usr/share/apport/general-hooks/ubuntu.py crashed:
  Traceback (most recent call last):
-   File "/usr/lib/python3/dist-packages/apport/report.py", line 198, in 
_run_hook
-     symb['add_info'](report, ui)
-   File "/usr/share/apport/general-hooks/ubuntu.py", line 89, in add_info
-     check_attachment_for_errors(report, attachment)
-   File "/usr/share/apport/general-hooks/ubuntu.py", line 208, in 
check_attachment_for_errors
-     trim_dpkg_log(report)
-   File "/usr/share/apport/general-hooks/ubuntu.py", line 508, in trim_dpkg_log
-     report['DpkgTerminalLog'] = '\n'.join([str(line.decode('utf-8')) for line 
in lines])
-   File "/usr/share/apport/general-hooks/ubuntu.py", line 508, in <listcomp>
-     report['DpkgTerminalLog'] = '\n'.join([str(line.decode('utf-8')) for line 
in lines])
+   File "/usr/lib/python3/dist-packages/apport/report.py", line 198, in 
_run_hook
+     symb['add_info'](report, ui)
+   File "/usr/share/apport/general-hooks/ubuntu.py", line 89, in add_info
+     check_attachment_for_errors(report, attachment)
+   File "/usr/share/apport/general-hooks/ubuntu.py", line 208, in 
check_attachment_for_errors
+     trim_dpkg_log(report)
+   File "/usr/share/apport/general-hooks/ubuntu.py", line 508, in trim_dpkg_log
+     report['DpkgTerminalLog'] = '\n'.join([str(line.decode('utf-8')) for line 
in lines])
+   File "/usr/share/apport/general-hooks/ubuntu.py", line 508, in <listcomp>
+     report['DpkgTerminalLog'] = '\n'.join([str(line.decode('utf-8')) for line 
in lines])
  UnicodeDecodeError: 'utf-8' codec can't decode bytes in position 14333-14334: 
invalid continuation byte
  
  I'm afraid I don't know which software package this second error falls
  under.
  
  [Test Case]
  
  I'm not sure about this, but I think it may have to do with me already
  bind-mounting /var/lib/lxd off the boot drive because it's too small to
  support the data (using https://github.com/kstenerud/ubuntu-dev-
  installer/blob/master/map-vm-paths.sh). The exact sequence of commands I
  used to trigger the bug are:
  
  apt update
  apt dist-upgrade -y
  apt autoremove -y
  do-release-upgrade
  
  [Regression Potential]
  
  TBD
  
  ProblemType: Package
  DistroRelease: Ubuntu 18.10
  Package: lxd 3.0.2-0ubuntu1~18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
  Uname: Linux 4.15.0-39-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  Date: Tue Dec 11 09:25:57 2018
  ErrorMessage: new lxd package pre-installation script subprocess returned 
error exit status 1
  InstallationDate: Installed on 2018-03-23 (262 days ago)
  InstallationMedia: Ubuntu-Server 18.04 LTS "Bionic Beaver" - Alpha amd64 
(20180322.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 
3.6.7-1~18.10
  PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal, 2.7.15-3
  RelatedPackageVersions:
-  dpkg 1.19.0.5ubuntu5
-  apt  1.7.0
+  dpkg 1.19.0.5ubuntu5
+  apt  1.7.0
  SourcePackage: lxd
  Title: package lxd 3.0.2-0ubuntu1~18.04.1 failed to install/upgrade: new lxd 
package pre-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to cosmic on 2018-12-11 (0 days ago)

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https://bugs.launchpad.net/bugs/1807856

Title:
  During do-release-upgrade from 18.04 to 18.10: package lxd
  3.0.2-0ubuntu1~18.04.1 failed to install/upgrade: new lxd package pre-
  installation script subprocess returned error exit status 1

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