gnome-software dumps core and here is the backtrace (not sure if related,
gnome-software also fails to install any app, just says "Pending" and stays
that way until you hit on Cancel).

#0  0x00007fd224eb30e1 in _g_log_abort (breakpoint=breakpoint@entry=1) at
gmessages.c:487
#1  0x00007fd224eb5821 in g_log_writer_default (log_level=6, 
    log_level@entry=G_LOG_LEVEL_ERROR, fields=fields@entry=0x7ffc6012e700,
n_fields=n_fields@entry=6, user_data=user_data@entry=0x0) at gmessages.c:2382
#2  0x00007fd224eb3c7c in g_log_structured_array (log_level=G_LOG_LEVEL_ERROR,
fields=0x7ffc6012e700, n_fields=6) at gmessages.c:1770
#3  0x00007fd224eb3f79 in g_log_structured
(log_domain=log_domain@entry=0x7fd2263e06ee "Gdk",
log_level=log_level@entry=G_LOG_LEVEL_ERROR) at gmessages.c:1597
#4  0x00007fd2263d4920 in gdk_event_source_check (base=0xf70000) at
gdkeventsource.c:92
#5  0x00007fd224ead269 in g_main_context_check (context=context@entry=0x8d7f40,
max_priority=2147483647, fds=fds@entry=0x13e1f30, n_fds=n_fds@entry=5) at
gmain.c:3762
#6  0x00007fd224ead814 in g_main_context_iterate
(context=context@entry=0x8d7f40, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3926
#7  0x00007fd224ead98c in g_main_context_iteration
(context=context@entry=0x8d7f40, may_block=may_block@entry=1) at gmain.c:3990
#8  0x00007fd22546d46d in g_application_run (application=0x8d50e0
[GsApplication], argc=argc@entry=2, argv=argv@entry=0x7ffc6012f048) at
gapplication.c:2381
#9  0x000000000041f766 in main (argc=2, argv=0x7ffc6012f048) at gs-main.c:55
#0  0x00007fd224eb30e1 in _g_log_abort (breakpoint=breakpoint@entry=1) at
gmessages.c:487
#1  0x00007fd224eb5821 in g_log_writer_default (log_level=6, 
    log_level@entry=G_LOG_LEVEL_ERROR, fields=fields@entry=0x7ffc6012e700,
n_fields=n_fields@entry=6, user_data=user_data@entry=0x0) at gmessages.c:2382
#2  0x00007fd224eb3c7c in g_log_structured_array (log_level=G_LOG_LEVEL_ERROR,
fields=0x7ffc6012e700, n_fields=6) at gmessages.c:1770
#3  0x00007fd224eb3f79 in g_log_structured
(log_domain=log_domain@entry=0x7fd2263e06ee "Gdk",
log_level=log_level@entry=G_LOG_LEVEL_ERROR) at gmessages.c:1597
#4  0x00007fd2263d4920 in gdk_event_source_check (base=0xf70000) at
gdkeventsource.c:92
#5  0x00007fd224ead269 in g_main_context_check (context=context@entry=0x8d7f40,
max_priority=2147483647, fds=fds@entry=0x13e1f30, n_fds=n_fds@entry=5) at
gmain.c:3762
#6  0x00007fd224ead814 in g_main_context_iterate
(context=context@entry=0x8d7f40, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3926
#7  0x00007fd224ead98c in g_main_context_iteration
(context=context@entry=0x8d7f40, may_block=may_block@entry=1) at gmain.c:3990
#8  0x00007fd22546d46d in g_application_run (application=0x8d50e0
[GsApplication], argc=argc@entry=2, argv=argv@entry=0x7ffc6012f048) at
gapplication.c:2381
#9  0x000000000041f766 in main (argc=2, argv=0x7ffc6012f048) at gs-main.c:55
quit