What this is
Halfway through the Ubuntu 26.04 upgrade, a 37.8MB third-party package dragged the entire pipeline down to 6KB/s — under 7 Chinese characters per second on average. This was the most visible of three pitfalls in an ops engineer's upgrade log from last week.
He needed to take a three-year-old Ubuntu 22.04 server and step it up to 26.04. Ubuntu doesn't support skipping releases — you have to go 24.04 first, then 26.04, like a relay race where every leg has to be run in full.
The three pitfalls, in order:
- apt full-upgrade (Ubuntu's full upgrade command) stuck on a 37.8MB NodeSource package, speed collapsed to 6KB/s, and the entire upgrade flow was held up by serial queuing;
- The first do-release-upgrade (Ubuntu's official release upgrade tool) exited after only a few dozen seconds — the actual size of the downloaded upgrader tarball (1,275,049 bytes) didn't match the size registered in the mirror index (1,267,251 bytes); the mirror was syncing between old and new versions, and the engineer caught the inconsistent copy;
- The sneakiest: the upgrader simply said "no LTS version available." Yet 26.04 had been out for over half a year. The root cause was a flag bit in the metadata that hadn't flipped — the upgrader literally couldn't see the new release.
Total: about 1.5GB of downloads, two reboots, and over two hours — the surplus was almost all tuition.
Industry view
This isn't new in ops circles, but every time it surfaces, it gives us a headache.
The "chase the latest" camp argues that this stepwise, conservative, controllable cadence is exactly what made Ubuntu a de facto standard for enterprise servers — the five-year LTS (Long Term Support) window leaves room to plan.
The dissent is worth more airtime, in our view: plenty of senior ops engineers advocate "if it works, don't touch it." A widely shared belief: production stability outranks chasing new versions. Third-party repos, mirror sync gaps, hidden metadata flag bits — none of these pitfalls is fatal on its own, but stacked together they become incidents. The workarounds the author offers (temporarily disable third-party repos, switch mirrors, retry) are all manual — there is no "one-click perfect solution."
Worth flagging: the article's last line says the upgrade script supports a "hand it to the AI Agent" execution mode. But that also tells us that AI automation in these tasks plays the role of executor, not judge — it can run commands, but "should we upgrade, when, and which pitfall to route around" still has to be decided by a human.
Impact on regular people
For enterprise IT: Even a "routine upgrade" can be held up by uncontrollable factors like third-party dependencies or overseas mirror sync. Supply-chain visibility and rollback plans aren't luxuries.
For your career: This explains why IT colleagues say "upgrades need scheduling and a good window" — it's not procrastination, there really are pitfalls. When filing requests, bring more patience and fewer pushbacks.
For the consumer market: Many internet services you use run on Linux underneath. These upgrade incidents don't face users directly, but they show up in service availability and data latency.