I found it really hard to find good answers to this problem - It was such a shock, and so important, that I was surprised this site was not no.1 in a Google search.
After hours of trying different things and searching, I reverted to 57.2 and locked that in.
I know it's free software, and I've been using it for years, quite contentedly, but .... This is not the first time that a Ubuntu Thunderbird update has broken something important.
I found it really hard to find good answers to this problem - It was such a shock, and so important, that I was surprised this site was not no.1 in a Google search.
After hours of trying different things and searching, I reverted to 57.2 and locked that in.
Then, I accidentally came across https:/ /addons. thunderbird. net/en- us/ which contained the https:/ /ftp.mozilla/ pub/calendar/ lightning/ candidates/ solution - in French. That worked for me.
I know it's free software, and I've been using it for years, quite contentedly, but .... This is not the first time that a Ubuntu Thunderbird update has broken something important.
If this is not a bug, what it is?