Basic apt invocation...?

$ sudo apt list -a thunderbird
Listing... Done
thunderbird/testing 1:91.6.0-1 amd64
thunderbird/byzantium-security,now 1:91.6.0-1~deb11u1 amd64 [installed]
thunderbird/byzantium 1:78.14.0-1~deb11u1pureos1 amd64

what do I put in the terminal to remove installed t’bird above; then, what do I put in the terminal to install the v78?

Sorry about the basic stuff, but I just can’t work out where the underscores and hyphens go to get a working command despite using the insidious search engine for the past hour or so… (I also can’t understand why it doesn’t list in a form that usable, but I guess that’s just me.)

@pseud if you just want to remove thunderbird, then:

sudo apt remove thunderbird

should do it.

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Well, yes, but then what gets me


Try a command like:

sudo apt install thunderbird/byzantium


$ sudo apt install thunderbird/byzantium
[sudo] password for x: 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Selected version '1:78.14.0-1~deb11u1pureos1' (None:10/byzantium [amd64]) for 'thunderbird'
Suggested packages:
The following packages will be DOWNGRADED:
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
Need to get 42.5 MB of archives.
After this operation, 38.2 MB disk space will be freed.
Do you want to continue? [Y/n]


(I’d been trying to configure 1:78.14.0-1~deb11u1pureos1 to something meaningful…)

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It should work with something like

sudo apt install thunderbird=1:78.14.0-1~deb11u1pureos1

too, though.
And, please note that byzantium/security has a thunderbird from the 91 series, which probably has security fixes that isn’t in the 78 one, so you use the 78 series on your own risk (but you probably know that already).

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Thanks, that’s good to know too. I don’t know what v91’s done to me but it’s not good and any bug fixes are going to have to be suppressed for the need to use email…

(See here: Moz Bug 1755916 and PureOS Bug T1104)