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ubuntu@ubuntu:~/Desktop$ sudo apt install ./feitcsi-iwlwifi_2.0.0_all.deb 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'feitcsi-iwlwifi' instead of './feitcsi-iwlwifi_2.0.0_all.deb'
The following NEW packages will be installed:
  feitcsi-iwlwifi
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
43 not fully installed or removed.
Need to get 0 B/5774 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 /home/ubuntu/Desktop/feitcsi-iwlwifi_2.0.0_all.deb feitcsi-iwlwifi all 2.0.0 [5774 kB]
(Reading database ... 215252 files and directories currently installed.)
Preparing to unpack .../feitcsi-iwlwifi_2.0.0_all.deb ...
Unpacking feitcsi-iwlwifi (2.0.0) ...
dpkg: error processing archive /home/ubuntu/Desktop/feitcsi-iwlwifi_2.0.0_all.deb (--unpack):
 trying to overwrite '/lib/firmware/iwlwifi-cc-a0-77.ucode', which is also in package linux-firmware 20220329.git681281e4-0ubuntu3.31
dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)
Errors were encountered while processing:
 /home/ubuntu/Desktop/feitcsi-iwlwifi_2.0.0_all.deb
N: Download is performed unsandboxed as root as file '/home/ubuntu/Desktop/feitcsi-iwlwifi_2.0.0_all.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
E: Sub-process /usr/bin/dpkg returned an error code (1)