Built a fresh riscv64 image with

$ dpkg-query -W linux-* | grep 5.8
linux-generic	5.8.0.11.11
linux-headers-5.8.0-11-generic	5.8.0-11.13
linux-headers-generic	5.8.0.11.11
linux-image-5.8.0-11-generic	5.8.0-11.13
linux-image-generic	5.8.0.11.11
linux-image-unsigned-5.8.0-11-generic	
linux-modules-5.8.0-11-generic	5.8.0-11.13
linux-modules-extra-5.8.0-11-generic	5.8.0-11.13
linux-riscv-headers-5.8.0-11	5.8.0-11.13
linux-riscv-source-5.8.0

And booted it.

$ cat /proc/modules |cut -f1 -d\ | xargs -L1 modinfo | sed -n 's/filename: *//p' | xargs dpkg -S
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/fs/nls/nls_iso8859-1.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/dm-multipath.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/scsi/device_handler/scsi_dh_rdac.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/scsi/device_handler/scsi_dh_emc.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/scsi/device_handler/scsi_dh_alua.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/uio/uio_pdrv_genirq.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/uio/uio.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/net/sched/sch_fq_codel.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/gpu/drm/drm.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/gpu/drm/drm_panel_orientation_quirks.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/video/backlight/backlight.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/net/ipv4/netfilter/ip_tables.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/net/netfilter/x_tables.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/fs/autofs/autofs4.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/fs/btrfs/btrfs.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/blake2b_generic.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/raid10.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/raid456.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/async_tx/async_raid6_recov.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/async_tx/async_memcpy.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/async_tx/async_pq.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/async_tx/async_xor.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/async_tx/async_tx.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/crypto/xor.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/lib/raid6/raid6_pq.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/lib/libcrc32c.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/raid1.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/raid0.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/multipath.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/md/linear.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/net/phy/mscc/mscc.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/net/macsec.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/net/ethernet/cadence/macb.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/net/phy/phylink.ko
linux-modules-5.8.0-11-generic: /lib/modules/5.8.0-11-generic/kernel/drivers/i2c/busses/i2c-ocores.ko


Looks like all the default modules are from modules package. horay.