我正在尝试执行一项功能：在 Karaf 版本 4.2.6 中安装 webconsole，但在我尝试设置 Karaf 的每台计算机上，我收到此错误消息：
Error executing command: Error:
Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.6
无论是 Windows 还是 Linux Mint，我都无法安装 Webconsole。我已经卸载并重新安装了 Java 1.8.0_241 和 Maven 3.6.3，并在两个操作系统上设置了各自的环境变量。
我错过了什么吗？
这是完整的控制台日志：
org.apache.karaf.features.internal.util.MultiException: Error:
Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.6
at org.apache.karaf.features.internal.download.impl.MavenDownloadManager$MavenDownloader.<init>(MavenDownloadManager.java:91)
at org.apache.karaf.features.internal.download.impl.MavenDownloadManager.createDownloader(MavenDownloadManager.java:72)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:457)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:452)
at org.apache.karaf.features.internal.region.Subsystem.downloadBundles(Subsystem.java:452)
at org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:224)
at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:393)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1062)
at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$13(FeaturesServiceImpl.java:998)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Suppressed: java.io.IOException: Error downloading mvn:org.apache.karaf.webconsole/org.apache.karaf.webconsole.instance/4.2.6
at org.apache.karaf.features.internal.download.impl.AbstractRetryableDownloadTask.run(AbstractRetryableDownloadTask.java:77)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
... 3 more
Caused by: java.io.IOException: …