The Official Ubuntu Book
The recorded URL now redirects offsite — often an acquisition, rebrand, or wind-down; the destination is recorded in the telemetry below. Pulse has been flat over the last 30 days. Observation is liveness-only: no tracked press, repository, or traffic rank — existence is confirmed, momentum is unobserved.
HTTP liveness
realSignal telemetry
4 families · 1 observed · observed onlyamazon.comedge
direct originserver
ServerTranco rank
unranked
Analyst read
generated from the observed metrics above · no external narrativeThe Official Ubuntu Book's listed URL redirected off its original domain (to https://www.amazon.com/Official-Ubuntu-Book-9th/dp/0134513428/ref=as_li_ss_tl?_encoding=UTF8&pd_rd_i=0134513428&pd_rd_r=6AP3TSGB3KC611ZRC22V&pd_rd_w=7mVuR&pd_rd_wg=Y59QN&psc=1&refRID=6AP3TSGB3KC611ZRC22V&linkCode=sl1&tag=oxsin-20&linkId=6e5ccc0fed2797745aa55167d9d08f80) when we last probed it on Aug 24, 2026 — we mark it redirected, not dead. It has fewer than two observed signal families, so no Pulse Index is composed — the evidence strip shows what is and isn’t present. Observed footprint: 5 functional tags. It has no curated competitive-alternative edges yet, so the comparable set below is functional tag-similarity — read it with the confidence flags.
Comparable set
curated alternatives → functional tag-similarity| Company | Basis | Overlap | Pulse | 30d Δ | Status |
|---|---|---|---|---|---|
| The Art of R Programming:dev-tools | tag-overlap | 100% | 16.0 | 0.0 | → redirected |
| Introduction to Algorithmseducation | similar | 100% | 40.0 | +9.6 | ● live |
| Machines of Loving Graceeducation | similar | 100% | 40.0 | +7.2 | ● live |
| Ebook How to start with Machine Learningeducation | similar | 83% | 40.9 | +4.8 | ● live |
| Street Smart: The Rise of Cities and the Fall of Carseducation | similar | 80% | 40.0 | 0.0 | ● live |
| President Trump and Kanye West Whitehouse Meetingother | tag-overlap | 80% | 40.0 | 0.0 | ● live |
| The Passage of Powereducation | similar | 80% | 40.0 | 0.0 | ● live |
| Stubborn Attachmentseducation | similar | 80% | 40.0 | 0.0 | ● live |
Confidence reflects source and category coherence: curated = an editorially linked alternative; similar = strong functional tag-overlap in the same category; tag-overlap = shared tags only and may be noisy. Overlap is the shared functional-tag ratio (Jaccard) for tag-matched rows. Pulse is the observed-activity index real and 30d Δ its signed month change; a dash means insufficient observed history, never zero.
Structure
observed attributesFunding & team
not in sourceNo disclosed funding in our sources. Funding data covers only ~1% of the corpus (462 rounds across 79K products), so absence here is unknown, not zero— we don't estimate a number we can't source.