I’m using snap on those versions:
snap 2.39 snapd 2.39 series 16 ubuntu 18.04 kernel 4.15.0-51-generic
I’ve installed Thunderbird from the store
name: thunderbird summary: Mozilla Thunderbird email application publisher: Ken VanDine license: unset description: | Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features! commands: - thunderbird snap-id: k1Ml1O9GzSO2QftV0ZlWSbUfQ78nN460 tracking: beta refresh-date: 2018-11-27 channels: stable: – candidate: – beta: – edge: 60.6.1 2019-04-09 (33) 100MB - installed: 60.3.0 (29) 145MB -
I’ve also installed evince as snap package, but seems to be impossible to open a PDF attachment directly from thunderbird, I have to save it and then open from nautilus manually.
If you need more details let me know, thanks in advance.