humble hawksbill-- cannot install hector mapping package

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hello, i am running humble hawksbill on ubunty 22.04 and trying to install the hector mapping package. to do so i ran

sudo apt-get install ros-humble-hector-slam

but i got E: unable to locate package. I checked my sources.list file, and it contains

deb [arch=arm64 signed-by=/usr/share/keyrings/ros-archive-keyring.gpg] http://packages.ros.org/ros2/ubuntu jammy main

i am a super beginner, by the way. how can i install the hector mapping package?