Firstly, remove PPA from below directories:
/etc/apt/sources.list
/etc/apt/sources.list.d/ directory
Remark: add sudo as prefix due to permission. eg, 'sudo rm noob*'
Then, do an update:
$sudo apt update
/etc/apt/sources.list
/etc/apt/sources.list.d/ directory
Remark: add sudo as prefix due to permission. eg, 'sudo rm noob*'
Then, do an update:
$sudo apt update
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