Bdtyktl

I have a DELL laptop and I have upgraded Ubuntu on this machine without issue until now. I have tried several times to upgrade from 18.04 to 18.10 and I've tried some of the recommendations on this site to try and get it installed, but it always fails. I tried from Terminal and got more detail on the attempted upgrade when it failed which I have pasted below. Any ideas on what I'm doing wrong or could do to fix this? Thanks.

do-release-upgrade

Checking for a new Ubuntu release

Get:1 Upgrade tool signature [819 B]                                           

Get:2 Upgrade tool [1,255 kB]                                                  

Fetched 1,256 kB in 0s (0 B/s)                                                 

authenticate 'cosmic.tar.gz' against 'cosmic.tar.gz.gpg' 

extracting 'cosmic.tar.gz'

[sudo] password for steve: 



Reading cache



Checking package manager

Reading package lists... Done

Building dependency tree        

Reading state information... Done

Hit ie.archive.ubuntu.com/ubuntu bionic InRelease                       

Ign dl.google.com/linux/chrome/deb stable InRelease                     

Hit ppa.launchpad.net/gencfsm/ppa/ubuntu bionic InRelease               

Get:1 dl.google.com/linux/chrome/deb stable Release [943 B]             

Get:2 dl.google.com/linux/chrome/deb stable Release.gpg [819 B]         

Hit ppa.launchpad.net/klaus-vormweg/pan/ubuntu bionic InRelease         

Hit ppa.launchpad.net/morphis/anbox-support/ubuntu bionic InRelease     

Get:3 ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease [20.8 kB]    

Hit ppa.launchpad.net/ozmartian/apps/ubuntu bionic InRelease            

Get:4 ppa.launchpad.net/ondrej/php/ubuntu bionic/main i386 Packages [43.6 kB]

Get:5 ppa.launchpad.net/ondrej/php/ubuntu bionic/main amd64 Packages [43.6 kB]

Fetched 109 kB in 0s (0 B/s)                                                   



(appstreamcli:15338): GLib-CRITICAL **: 14:05:45.946: g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types || GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite (GVSB(builder)->type)' failed



(appstreamcli:15338): GLib-CRITICAL **: 14:05:45.947: g_variant_new_variant: assertion 'value != NULL' failed



(appstreamcli:15338): GLib-ERROR **: 14:05:45.947: g_variant_new_parsed: 11-13:invalid GVariant format string

Trace/breakpoint trap (core dumped)

Reading package lists... Done    

Building dependency tree          

Reading state information... Done



Updating repository information



Third party sources disabled 



Some third party entries in your sources.list were disabled. You can 

re-enable them after the upgrade with the 'software-properties' tool 

or your package manager. 



To continue please press [ENTER]



Hit http://ie.archive.ubuntu.com/ubuntu cosmic InRelease                       

Fetched 0 B in 0s (0 B/s)                                                      



(appstreamcli:15614): GLib-CRITICAL **: 14:06:55.537: g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types || GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite (GVSB(builder)->type)' failed



(appstreamcli:15614): GLib-CRITICAL **: 14:06:55.538: g_variant_new_variant: assertion 'value != NULL' failed



(appstreamcli:15614): GLib-ERROR **: 14:06:55.538: g_variant_new_parsed: 11-13:invalid GVariant format string

Trace/breakpoint trap (core dumped)

Hit http://ie.archive.ubuntu.com/ubuntu cosmic InRelease                       

Fetched 0 B in 0s (0 B/s)                                                      



(appstreamcli:15829): GLib-CRITICAL **: 14:07:05.466: g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types || GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite (GVSB(builder)->type)' failed



(appstreamcli:15829): GLib-CRITICAL **: 14:07:05.466: g_variant_new_variant: assertion 'value != NULL' failed



(appstreamcli:15829): GLib-ERROR **: 14:07:05.466: g_variant_new_parsed: 11-13:invalid GVariant format string

Trace/breakpoint trap (core dumped)

Hit http://ie.archive.ubuntu.com/ubuntu cosmic InRelease                       

Fetched 0 B in 0s (0 B/s)                                                      



(appstreamcli:16059): GLib-CRITICAL **: 14:07:13.383: g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types || GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite (GVSB(builder)->type)' failed



(appstreamcli:16059): GLib-CRITICAL **: 14:07:13.383: g_variant_new_variant: assertion 'value != NULL' failed



(appstreamcli:16059): GLib-ERROR **: 14:07:13.383: g_variant_new_parsed: 11-13:invalid GVariant format string

Trace/breakpoint trap (core dumped)



Error during update 



A problem occurred during the update. This is usually some sort of 

network problem, please check your network connection and retry. 



E:Problem executing scripts APT::Update::Post-Invoke-Success 'if 

/usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; 

then appstreamcli refresh-cache > /dev/null; fi', E:Sub-process 

returned an error code 





Restoring original system state



Aborting

Reading package lists... Done    

Building dependency tree          

Reading state information... Done

Tried the update through the Distribution Upgrade popup which appeared onscreen. It also failed with the following message:

Error during update

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.

E:Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/cache/app-info -a -e /usr/bin/appstreamcli; then appstreamcli refresh-cache > /dev/null; fi', E:Sub-process returned an error code.

I'm just thinking - if a couple of people have mentioned my internet connection was running, which it was, or if I was using a proxy, which I'm not and the latest try at upgrade showed that there may be a connection issue, could the laptopwifi adapter be getting switched off as it tries to update?