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https://issues.apache.org/jira/browse/HADOOP-17635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17324634#comment-17324634
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Masatake Iwasaki commented on HADOOP-17635:
-------------------------------------------

The setup procedure on Ubuntu 18.04 is different from 20.04. Uses of Ubuntu 
18.04 need to install gcc-9 from supplemental repository and cmake >= 3.19 from 
source code (after HDFS-15740). Leaving current instruction for Ubuntu 18.04 
could be useful until majority of users move to 20.04.

> Update the ubuntu version in the build instruction
> --------------------------------------------------
>
>                 Key: HADOOP-17635
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17635
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: build, documentation
>            Reporter: Akira Ajisaka
>            Priority: Major
>
> In BUILDING.txt
> {noformat}
> Installing required packages for clean install of Ubuntu 14.04 LTS Desktop:
> {noformat}
> Ubuntu 14 is already EoL, should be updated to 18 or 20.



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