hatte versehentlich das Netzteil des PI4 gezogen und dementsprechend den Pi aus gemacht.
Da Openhab leider nicht automatisch startet (Bin dummer User, der nicht weiß, wie ein service automatisch beim Systemstart mitstartet) hab ich mich mit dem PI-User per Putty angemeldet und durch
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sudo systemctl start openhab2.service
im Web-Browser die ip mit Port 8080 aufgerufen und mich gefreut das alles läuft.

"Leider" hab ich mir dann gedacht, wenn ich schon mal auf dem pi bin, einfach mal
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sudo apt-get update/upgrade

Tja, da hab ich wohl etwas falsch gemacht. Obwohl ich openhab gestartet hab und
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sudo systemctl status openhab2.service
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HTTP ERROR 404
Problem accessing /start/index. Reason:
Not Found
Wo kann/muss ich anfangen zu prüfen, was ich machen kann?
Hab die letzte Stable installiert
Auszug aus dem/der Karaf:
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openhab> feature:list | grep Started
feature x 4.2.7 x x x Started x standard-4.2.7 x Features Support
shell x 4.2.7 x x x Started x standard-4.2.7 x Karaf Shell
deployer x 4.2.7 x x x Started x standard-4.2.7 x Karaf Deployer
wrapper x 4.2.7 x x Started x standard-4.2.7 x Provide OS integration
bundle x 4.2.7 x x x Started x standard-4.2.7 x Provide Bundle support
config x 4.2.7 x x x Started x standard-4.2.7 x Provide OSGi ConfigAdmin support
diagnostic x 4.2.7 x x x Started x standard-4.2.7 x Provide Diagnostic support
instance x 4.2.7 x x x Started x standard-4.2.7 x Provide Instance support
jaas x 4.2.7 x x x Started x standard-4.2.7 x Provide JAAS support
log x 4.2.7 x x x Started x standard-4.2.7 x Provide Log support
package x 4.2.7 x x x Started x standard-4.2.7 x Package commands and mbeans
service x 4.2.7 x x x Started x standard-4.2.7 x Provide Service support
system x 4.2.7 x x x Started x standard-4.2.7 x Provide System support
http x 4.2.7 x x Started x standard-4.2.7 x Implementation of the OSGI HTTP Service
pax-http-service x 7.2.11 x x Started x standard-4.2.7 x Pax-Web OSGi HTTP Service
kar x 4.2.7 x x x Started x standard-4.2.7 x Provide KAR (KARaf archive) support
ssh x 4.2.7 x x x Started x standard-4.2.7 x Provide a SSHd server on Karaf
eventadmin x 4.2.7 x x x Started x standard-4.2.7 x OSGi Event Admin service specification for event-
scr x 4.2.7 x x Started x standard-4.2.7 x Declarative Service support
pax-web-core x 7.2.11 x x Started x org.ops4j.pax.web-7.2.11 x Provide Core pax-web bundles
pax-jetty x 9.4.20.v20190813 x x Started x org.ops4j.pax.web-7.2.11 x Provide Jetty engine support
pax-http-jetty x 7.2.11 x x Started x org.ops4j.pax.web-7.2.11 x
pax-http x 7.2.11 x x Started x org.ops4j.pax.web-7.2.11 x Implementation of the OSGI HTTP Service
pax-http-whiteboard x 7.2.11 x x Started x org.ops4j.pax.web-7.2.11 x Provide HTTP Whiteboard pattern support
openhab-core-base x 2.5.0 x x Started x distro-2.5.0 x openHAB Core
openhab-core-auth-oauth2client x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-ephemeris x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-io-console-karaf x 2.5.0 x x Started x distro-2.5.0 x Karaf Console support for SmartHome stuff
openhab-core-io-rest-sitemap x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-io-rest-audio x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-io-rest-voice x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-io-rest-mdns x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-io-transport-mdns x 2.5.0 x x Started x distro-2.5.0 x
openhab.inc-model-core x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-item x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-item-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-persistence x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-persistence-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-rule x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-rule-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-script x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-script-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-sitemap x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-sitemap-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-thing x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-thing-ide x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-model-lsp x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-storage-json x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-ui x 2.5.0 x x Started x distro-2.5.0 x
openhab-core-ui-icon x 2.5.0 x x Started x distro-2.5.0 x
openhab-runtime-base x 2.5.0 x x x Started x distro-2.5.0 x openHAB Runtime Base
openhab-runtime-certificate x 2.5.0 x x Started x distro-2.5.0 x SSL Certificate Generator
openhab-transport-http x 2.5.0 x x Started x distro-2.5.0 x HTTP Transport
openhab-transport-mdns x 2.5.0 x x Started x distro-2.5.0 x mDNS Transport
openhab.tp-base x 2.5.0 x x Started x distro-2.5.0 x openHAB Core Target Platform Base
openhab.tp-commons-net x 2.5.0 x x Started x distro-2.5.0 x The Apache Commons Net library
openhab.tp-gson x 2.5.0 x x Started x distro-2.5.0 x Gson
openhab.tp-jax-rs x 2.5.0 x x Started x distro-2.5.0 x
openhab.tp-jax-rs-min x 2.5.0 x x Started x distro-2.5.0 x
openhab.tp-kat.cpy-jersey-min-2.22.2 x 2.5.0 x x Started x distro-2.5.0 x
openhab.tp-jollyday x 2.5.0 x x Started x distro-2.5.0 x Jollyday library
openhab.tp-jmdns x 2.5.0 x x Started x distro-2.5.0 x An implementation of multi-cast DNS in Java.
openhab.tp-lsp4j x 2.5.0 x x Started x distro-2.5.0 x Eclipse LSP4J
openhab.tp-xtext x 2.5.0 x x Started x distro-2.5.0 x Xtext - Language Engineering Made Easy
openhab.tp-xtext-ide x 2.5.0 x x Started x distro-2.5.0 x Xtext - IDE Support