So I stumbled accross this URL today:
Does that mean that it is a "workable" environment, meaning it can be installed like any other full-fledged release build, although it might be buggy and trigger unexpected situational failures?
Or ... is that simply a Work-in-Progress ... without a full set of minimal capabilities for different functions/tools/services?
I ask because I've reached a state where I don't trust my current level of Thunderbird, and want to upgrade that, but when I attempted to install a late-release build, it came up with missing libraries, meaning I would have to upgrade my OS and didn't want to do that, on my primary OS/disk.
I'm hoping I can prove things out on my secondary OS/disk.
Would that build be safe enough to install Thunderbird and run it at that level, without worries, until I perform the official 26.04 LTS release install?
It's the daily same as every cycle... Myself I'm using Ubuntu resolute, ie
guiverc@d7050-next:~/uwn$ lsb_release -d
Description: Ubuntu Resolute Raccoon (development branch)
though this install doesn't have the full Ubuntu-MATE install on it, but this is only one of my resolute installs.
There is discussion on UD on this thread, and do note on occasion daily builds will fail (ie. the URL you provided at top shows 20251119 currently in current which is older than I'd expect to see, but issues do occur during a development cycle and they are fixed given time; so I'd not worry about a few days behind).
You can install & use it normally; Ubuntu resolute questions will be off-topic at many support sites (including Ubuntu Discourse, Ask Ubuntu & more), and problems can occur, but my primary install has run the development release since artful or back in the 17.10 cycle.
You can apply upgrades normally; though on one install I have, I don't apply upgrades at all during a cycle; just non-destructively re-install the box achieving my upgrades that way at the same time as completing a QA test.. alas since late in the noble cycle the ubuntu-desktop-installer has forced a format of / so I'm only doing that with the calamares ISOs so not Ubuntu-MATE.
Please note the following: it's been documented that dailies may NOT be produced this cycle, except when required or helpful, so ISOs there could be stale at times. The hope was to move to monthly snapshots starting mid-late November 2025, ie. ~now, so they may stop being produced when monthly snapshots and the new testing procedures are fully functional. Either way, an install from a daily will have you running Ubuntu [MATE] resolute which you can treat like any development system and just update normally (which may require apt full-upgrade too)
I like to add link, but its not a link I've used in a couple of weeks, so it's not handy, on the Ubuntu resolute cycle QA/testing & images
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Eric
On a separate laptop I went through all the upgrades from 24.04.3 LTS to 26.04 (now with Kernel 6.17 and Mate 1.28.2). Upgrades and daily updates are by the ton…
There was a few error messages along the way, but they solved by themselves with the updates.
It seems to work pretty well, no bugs that I can see (given basic usage, no fancy tries or ‘exotic’ installs).
Still on 24.04.3 LTS on my daily working station, though. Like Guiverc I used to run development release (always new version) since 17.10. This time around and since having to primary install on a new laptop and with the 25.10 issues, I did hesitate and I did stick with 24.04.3 LTS.
I’ll probably soon trigger the upgrades on my day to day machine, given the ‘no-bug’ case on my other laptop.
W
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Thank you very much for all that detail and overview, Chris! It's giving me the confidence to stick my toe into the "bleeding edge" waters (which convinced me to go looking for this image I had found back in the late 1980s, at the time I was trying to get our Nortel London, Ontario divisional management to start using Expert Systems for mechanical design semi-automation):
Digital scan of old photocopy from a technical magazine! 
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Merci énormément, @Watford ! C'est bien apprécié!
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Someone seems to be quite busy out there…
On this other laptop now running on UM 26.04 development release, the updates quasi daily and numerous.
W
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