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Unable to open TB profile

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Mint 20.1 Cinnamon (64 bit) Thunderbird 78.7.1 (64 bit)

My working Thunderbird profile is in a sub folder of a HDD drive where all my data is kept. This has worked fine for years. This morning it didn’t. TB profile manager is set to open my selected profile without asking at startup. When I clicked the icon to start TB it presented me with a profile startup page as if I had never used it in the past – Welcome to Mozilla Thunderbird 78.7.1/set up new email address & etc.

I used profile manager $ thunderbird -p to see if it was looking at my normal profile and it was. I run a nightly backup of my data HDD so set up a new profile using the previous nights version. This also failed to start TB and again just presented me with a Welcome to Mozilla screen. So what has changed? There were some updates when I first logged on this morning one of which was a new kernel. I installed the updates before commencing anything else. I had been using kernel 5.4.0-70, the new one was 5.4.0-72. I looked around but could not find any reports of the replacement kernel giving any trouble with TB but rebooted into the previous one just in case. Still unable to access my profile. I have five days of backup files so I tried an earlier profile but that would not load either.

Don’t know where to go from here. Can anyone offer a suggestion please?

Mint 20.1 Cinnamon (64 bit) Thunderbird 78.7.1 (64 bit) My working Thunderbird profile is in a sub folder of a HDD drive where all my data is kept. This has worked fine for years. This morning it didn’t. TB profile manager is set to open my selected profile without asking at startup. When I clicked the icon to start TB it presented me with a profile startup page as if I had never used it in the past – Welcome to Mozilla Thunderbird 78.7.1/set up new email address & etc. I used profile manager $ thunderbird -p to see if it was looking at my normal profile and it was. I run a nightly backup of my data HDD so set up a new profile using the previous nights version. This also failed to start TB and again just presented me with a Welcome to Mozilla screen. So what has changed? There were some updates when I first logged on this morning one of which was a new kernel. I installed the updates before commencing anything else. I had been using kernel 5.4.0-70, the new one was 5.4.0-72. I looked around but could not find any reports of the replacement kernel giving any trouble with TB but rebooted into the previous one just in case. Still unable to access my profile. I have five days of backup files so I tried an earlier profile but that would not load either. Don’t know where to go from here. Can anyone offer a suggestion please?