i think it could linked with some installed package
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https://bugs.launchpad.net/bugs/1787704
Title:
sudo do-release-upgrade
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Public bug reported:
54,8 M o réceptionnés en 6s (383 k o/s)
(appstreamcli:6733): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:6733): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL'
failed
AppStream cache