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I have seen this happen when running out of system memory - to confirm that is what is happening you can check /var/log/syslog for a recent out of memory termination of your terminal.

A couple possible work arounds:

• add "--executor sequential" to your colcon command to reduce how much is build in parallel
• add more memory if your system is a VM (mine was - bumping from 8gb to 16gb and running sequentially allowed my workspace to build).

I have seen this happen when running out of system memory - to confirm that is what is happening you can check /var/log/syslog for a recent out of memory termination of your terminal.

A couple possible work arounds:

• add "--executor sequential" to your colcon command to reduce how much is build in parallel
• add more memory if your system is a VM (mine was - bumping from 8gb to 16gb and running sequentially allowed my workspace to build).
• build highly memory consuming packages individually by adding "--package-select package_name" to your colcon command