keybase not supported for Ubuntu 24.05

When upgrading to Ubuntu 24.05, the installer decided keybase was no longer neede!?

After the upgrade, the deb file delivered from keybase.io is not supported.

The snap requires snap set system experimental.user-daemon=true, which requires more work. How do we do this?

The Nix package install, but I get permission errors when running kbfs.

~ (master) [1]> sudo apt install ./keybase_amd64.deb
Reading package lists... Done
E: Unsupported file ./keybase_amd64.deb given on commandline
matstage@matstage ~ (master) [100]> sudo apt install keybase
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done

No apt package "keybase", but there is a snap with that name.
Try "snap install keybase"

E: Unable to locate package keybase
matstage@matstage ~ (master) [64]> snap install keybase
error: cannot install "keybase": experimental feature disabled - test it by setting
'experimental.user-daemons' to true

-----------------
OS: Ubuntu 24.04 LTS x86_64
Host: 450R4E/450R5E/450R4V/450R5V/4450RV P08RBG
Kernel: 6.8.0-31-generic
Uptime: 4 hours, 14 mins
Packages: 3351 (dpkg), 599 (nix-user), 50 (nix-default), 63 (flatpak), 30 (snap)
Shell: bash 5.2.21
Resolution: 1366x768
DE: GNOME
WM: Mutter
WM Theme: Adwaita
Theme: Yaru-olive-dark [GTK2/3]
Icons: Yaru-olive [GTK2/3]
Terminal: kitty
CPU: Intel i3-3120M (4) @ 2.500GHz
GPU: Intel 3rd Gen Core processor Graphics Controller
GPU: NVIDIA GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M
Memory: 3904MiB / 7827MiB

Start by reproducing the reported installation behavior on Ubuntu 24.04, checking the deb, snap, and Nix installation paths described in the issue. Done means a supported Keybase installation path is documented or restored and kbfs runs without the reported permission or installation errors.

Written by the indexing model from the issue text.