Hi all, I had a weird problem I'm a bit of a noob to Unix so I don't know how much information I can or should give & a lot of this is from memory, apologies for the length of this I'm using Zorin 15.3 (64 bit) it's basically Ubuntu, on a Dell Precision T1700 with 7.7Gb RAM, Intel® Core™ i7-4770 CPU @ 3.40GHz × 8, Quadro K600/PCIe/SSE2 graphics And I also use Thunderbird 78.7.0 (64-bit), ubunti-snap-build - 1.0, on the release channel Thunderbird updates are disabled by the system administrator, all my updates come via the Software Updater tool So far so good, system has been working well for about a year now A couple of days ago I was working on something when I decided to check mail So I clicked on the thunderbird icon, I normally leave it open & it's pinned to to the toolbar, and instead of opening I got a popup OK, my bad, I should have been paying attention to the popup, but I was neck deep in something else & didn't give it the attention it deserved before dismissing it, sorry Then I noticed I had 2 Thunderbird icons on the task bar, clicking the second one let me see my email I couldn't find anything on line about having 2 Thunderbird instances running So as this wasn't normal, I dropped everything I was doing & rebooted, that's when my problems really started Opening Thunderbird I couldn't see any emails, digging around I found I had 2 profiles one was <randomnumber>.default the other was <randomnumber>.default-beta I guess the 2nd profile was created when I thought I dismissed the popup, I must read them in future Now I don't know how to swap profiles, but I do know how to copy them for backups So I renamed the ".default-beta" profile & replaced it with the ".default" profile This let me see & use email Then I noticed I couldn't open links in emails, I couldn't even open Thunderbird help with F1 Looking in Preferences > Files & Attachments, I could see a setting for HTTPS, but I couldn't get it to use my browser So I decided to use the nuclear option I backed up my profile, removed & then reinstalled Thunderbird using the Software tool And just to be sure I ran the Software Updater, which said there were no updates So as far as I'm aware the version I installed from the store was the same version I was running before so copying the profile back should pretty much restore everything Not so, starting Thunderbird got me a popup again, I read this one It said the profile I was trying to use ''was created in a later version of Thunderbird'' & gave me the option of cancelling or creating a new profile Now I have no idea how I got a later version, Software Updater & the Software tools were telling me I had the latest released version, Thunderbird can update itself but this is disabled, so I've no clue where the later version came from So I dug around on the web & found no help, nothing I found seemed to match the issue I had So I got creative, I had very little to lose at this point I restored the empty profile that this version of Thunderbird created, which let me start Thunderbird, I then had a look at the profile I worked out where the mail was stored, a subfolder called "Mail" & put a copy of my backup Mail folder in there That got me my mail I tried copying my address book & calendar in a similar manner but nothing worked & I eventually ended up putting them back in manually Now I think I've got everything back & it all seems to work, all I've lost is a bit of time & a few grey hairs But I'd like to know how this happened in the first place ? Where did this 2nd instance of Thunderbird come from ? Is Thunderbird somehow doing developer channel updates or something ? If it is how do I stop it doing this again ? Thank you for your patience in reading this, any suggestions will be gratefully received