I just got these on an impish system by using the VitualBox VM menu item Devices > Insert Virtualbox Additions CD image...
From there
Code:
cd /media/`whoami`/VBox_GAs_6.1.26
./VBoxLinuxAdditions.run
It provided a notification that it required a build environment and to install gcc make perl, so I also ran
Code:
apt install gcc make perl
After that,
Code:
sudo rcvboxadd setup
built the kernel modules and updated the initramfs. I rebooted to get the new modules as the output suggested and verified that Bidirectional copy/paste are working.
