These modules are provided by linux-modules, not linux-modules-extra:
$ dpkg -L linux-modules-5.15.0-1015-raspi | grep -E 'usbserial|ftdi'
/lib/modules/5.15.0-1015-raspi/kernel/drivers/usb/serial/ftdi_sio.ko
/lib/modules/5.15.0-1015-raspi/kernel/drivers/usb/serial/usbserial.ko


** Changed in: linux-raspi (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1990595

Title:
  Kernel Module usbserial not available on Jammy 22.04 (Raspi 4)

Status in linux-raspi package in Ubuntu:
  Invalid

Bug description:
  After installing a USB to Serial Adapter on a Raspberry Pi 4 running
  Ubuntu Server 22.04 LTS, no tty device is created under /dev/ttyUSB...

  dmesg:
  [    3.793123] usb 1-1.2.1: New USB device found, idVendor=0403, 
idProduct=6001, bcdDevice= 6.00
  [    3.793142] usb 1-1.2.1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
  [    3.793149] usb 1-1.2.1: Product: FT232R USB UART
  [    3.793155] usb 1-1.2.1: Manufacturer: FTDI
  [    3.793160] usb 1-1.2.1: SerialNumber: A504D2PO

  The usbserial and ftdi_sio kernel modules are not included in the
  linux-modules-extra-5.15.0-1015-raspi package.

  dpkg-query -L linux-modules-extra-5.15.0-1015-raspi |grep -E 
'usbserial|ftdio_sio'
  => NO OUTPUT

  lsb_release -rd:
  Description:    Ubuntu 22.04.1 LTS
  Release:        22.04

  uname -a:
  Linux Host 5.15.0-1014-raspi #16-Ubuntu SMP PREEMPT Thu Aug 25 09:50:55 UTC 
2022 aarch64 aarch64 aarch64 GNU/Linux

  For Reference:
  https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1947723

  Configuration from /boot/config-5.15.0-1014-raspi:
  grep USB_SERIAL /boot/config-5.15.0-1014-raspi
  CONFIG_USB_SERIAL=m               <= set
  CONFIG_USB_SERIAL_GENERIC=y       <= set
  CONFIG_USB_SERIAL_FTDI_SIO=m      <= set

  Fix:
  According to the configuration, the modules should be built. Include the 
modules in the package.

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