Binary package “sl-modem-dkms” in ubuntu jammy
SmartLink software modem driver - module building source
This package contains source code for the low-level drivers for the
software modems produced by Smart Link Ltd. It supports PCI and USB models.
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In addition to this package, you will need the package sl-modem-daemon
which implements the application part of the driver.
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Module packages can be built for the custom kernel package either by hand or
using DKMS.