ubuntu18.04.1 :sudo apt-get update报错 GLib-ERROR

一、报错内容：

(appstreamcli:1974): GLib-CRITICAL **: 07:45:39.363: 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:1974): GLib-CRITICAL **: 07:45:39.363: g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:1974): GLib-ERROR **: 07:45:39.363: g_variant_new_parsed: 11-13:invalid GVariant format string
Trace/breakpoint trap (core dumped)
正在读取软件包列表... 完成
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

二、解决

sudo apt-get install --reinstall libappstream4

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