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68.7 says incompatible with shared 68.8 profile

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I share a profile between windows and ubuntu 18.04 boots. WIndows automatically upgraded to 68.8; Ubuntu is still at 68.7. I can no longer use it on Ubuntu, because it says 68.7 is an older browser. I see nothing in the 68.8 release notes indicating profile changes. I'm wondering if there is an incompatibility, and more importantly how this can be worked around.

I share a profile between windows and ubuntu 18.04 boots. WIndows automatically upgraded to 68.8; Ubuntu is still at 68.7. I can no longer use it on Ubuntu, because it says 68.7 is an older browser. I see nothing in the 68.8 release notes indicating profile changes. I'm wondering if there is an incompatibility, and more importantly how this can be worked around.

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You're supposed to keep both installations updated. Thunderbird has an inbuilt measure that prevents downgrading a profile. It has been this way for a long time.