I applied the same workaround and it works.
I've to tell you that upgrade is not the true reason.
It happened to my UbuntuStudio 16.04 with Thunderbird 68.7.0 (64bit) and I've not upgrade anything.
Yesterday night Thunderbird worked as always ... this morning had the issue.
Thanks a lot for the workaround indeed
I applied the same workaround and it works.
I've to tell you that upgrade is not the true reason.
It happened to my UbuntuStudio 16.04 with Thunderbird 68.7.0 (64bit) and I've not upgrade anything.
Yesterday night Thunderbird worked as always ... this morning had the issue.
Thanks a lot for the workaround indeed