Update: now root-builds do not work anymore.
first it succesfully created a camel-service-unit
then the "Error transferring file: repo1.maven.org" problem
raised again, but this time under root.
I continue to not understand why:
Here is the mvn commands output:

Thanks again,
Andrea

/* service-unit (successful) */

and...@martin:~/Programmi/apache-servicemix-3.3/tutorials/3_camel$ sudo mvn
archetype:create -DarchetypeArtifactId=servicemix-camel-service-unit
-DarchetypeGroupId=org.apache.servicemix.tooling
-DartifactId=tutorial-camel-su
[sudo] password for andrea:
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'archetype'.
[INFO] org.apache.maven.plugins: checking for updates from central
[INFO] org.codehaus.mojo: checking for updates from central
[INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking
for updates from central

[Various downloads...]
[INFO] BUILD SUCCESSFUL
[...]

/* Now the service-assembly (build error) */

and...@martin:~/Programmi/apache-servicemix-3.3/tutorials/3_camel$ mvn -e
archetype:create -DarchetypeArtifactId=servicemix-service-assembly
-DarchetypeGroupId=org.apache.servicemix.tooling
-DartifactId=tutorial-camel-sa
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] Reactor build order:
[INFO]   SMX-Camel :: Tutorial
[INFO]   A Camel based JBI Service Unit
[INFO] Searching repository for plugin with prefix: 'archetype'.
[INFO] org.apache.maven.plugins: checking for updates from central
[WARNING] repository metadata for: 'org.apache.maven.plugins' could not be
retrieved from repository: central due to an error: Error transferring file:
repo1.maven.org
[INFO] Repository 'central' will be blacklisted
[INFO]
------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO]
------------------------------------------------------------------------
[INFO] The plugin 'org.apache.maven.plugins:maven-archetype-plugin' does not
exist or no valid version could be found
[INFO]
------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: The plugin
'org.apache.maven.plugins:maven-archetype-plugin' does not exist or no valid
version could be found
    at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(DefaultLifecycleExecutor.java:1546)
    at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor(DefaultLifecycleExecutor.java:1786)
    at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.segmentTaskListByAggregationNeeds(DefaultLifecycleExecutor.java:446)
    at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:176)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.version.PluginVersionNotFoundException:
The plugin 'org.apache.maven.plugins:maven-archetype-plugin' does not exist
or no valid version could be found
    at
org.apache.maven.plugin.version.DefaultPluginVersionManager.resolvePluginVersion(DefaultPluginVersionManager.java:229)
    at
org.apache.maven.plugin.version.DefaultPluginVersionManager.resolvePluginVersion(DefaultPluginVersionManager.java:91)
    at
org.apache.maven.plugin.DefaultPluginManager.verifyPlugin(DefaultPluginManager.java:172)
    at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.verifyPlugin(DefaultLifecycleExecutor.java:1517)
    ... 14 more

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