Ubuntu 22.04 was accepted by detect_os but the runtime apt list has never
resolved on jammy, which ships dhcpcd5 rather than dhcpcd-base. No CI cell
or E2E matrix installs on it, and the install docs already claim Ubuntu
26.04 and Debian 13 only, so drop the claim instead of carrying a
jammy-conditional package branch for an untested suite.
setup.sh aborts twice on resolute. qemu-kvm is a virtual package with two
providers there, so apt refuses to resolve it; the token was redundant anyway
since $QEMU_PACKAGES already installs qemu-system-x86/arm and spinifex execs
the qemu-system-* binaries directly.
sudo-rs, Ubuntu's default sudo since 25.10, then rejects the sudoers file: it
implements no pam_session Defaults setting, and forbids a wildcard inside a
command argument. pam_session is now emitted only for classic sudo, and the
sysctl grant names a fixed-verb helper instead of a wildcard.
The helper is narrower than the rule it replaces: it accepts one interface, a
key restricted to rp_filter or accept_local, and a value restricted to 0 or 1,
where the old grant permitted any net.ipv4.conf key at any value. Granting
sysctl with an unconstrained argument was rejected as root-equivalent.
Adds scripts/lint-apt-packages.sh and an Apt Packages workflow so the runtime
package list is resolved against each supported suite's real indices in CI.
Julian Sommer