我该如何解决这个问题？
➜ ~ sudo apt-get upgrade
[sudo] password for szymon:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
dkms docker-ce-cli fwupd fwupd-signed libegl-mesa0 libfwupd2 libfwupdplugin1 libgbm1 libgl1-mesa-dri libgl1-mesa-dri:i386 libglapi-mesa
libglapi-mesa:i386 libglx-mesa0 libglx-mesa0:i386 libnvidia-cfg1-450 libnvidia-compute-450 libnvidia-compute-450:i386
libnvidia-decode-450 libnvidia-decode-450:i386 libnvidia-encode-450 libnvidia-encode-450:i386 libnvidia-extra-450 libnvidia-fbc1-450
libnvidia-fbc1-450:i386 libnvidia-gl-450 libnvidia-gl-450:i386 libnvidia-ifr1-450 libnvidia-ifr1-450:i386 libxatracker2
linux-modules-nvidia-440-generic-hwe-20.04 linux-modules-nvidia-450-generic-hwe-20.04 mesa-va-drivers mesa-vdpau-drivers
mesa-vulkan-drivers mesa-vulkan-drivers:i386 nvidia-compute-utils-450 nvidia-dkms-450 nvidia-driver-450 nvidia-kernel-common-450
nvidia-kernel-source-450 nvidia-utils-450 ubuntu-advantage-tools xserver-xorg-video-nvidia-450
0 upgraded, 0 newly installed, 0 to remove and 43 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
Setting up initramfs-tools (0.136ubuntu6.6) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.136ubuntu6.6) ...
update-initramfs: Generating /boot/initrd.img-5.11.0-25-generic
W: Possible missing firmware /lib/firmware/i915/skl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/glk_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/cml_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/icl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/ehl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/ehl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_huc_7.5.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_huc_7.5.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/tgl_guc_49.0.1.bin for module i915
W: Possible missing firmware /lib/firmware/i915/dg1_dmc_ver2_02.bin for module i915
cat: write error: No space left on device
update-initramfs: failed for /boot/initrd.img-5.11.0-25-generic with 1.
dpkg: error processing package initramfs-tools (--configure):
installed initramfs-tools package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)