Ethernet connection "unavailable"

I've searched all related questions to this topic, to no avail. I've got an ethernet card on my laptop, but the connection will not work. I checked in the BIOS, and the card is enabled. I can't undestand why mncli list my ethernet connection as "unavailable"... Here are below the results of different command I used to investigate the issue. I used Linux Mint on a Dell Latitude e5520. Any advise highly appreciated. Best regards, MC

mc@mc-Latitude-E5520:~$ lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
[...]
09:00.2 Mass storage controller: O2 Micro, Inc. O2 Flash Memory Card (rev 05)
0a:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5761 Gigabit Ethernet PCIe (rev 10)

mc@mc-Latitude-E5520:~$  sudo lshw -c network -sanitize
  *-network                 
       description: Wireless interface
       product: Centrino Advanced-N 6205 [Taylor Peak]
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 34
       serial: [REMOVED]
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=6.8.0-58-generic firmware=18.168.6.1 6000g2a-6.ucode ip=[REMOVED] latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:27 memory:e5300000-e5301fff
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5761 Gigabit Ethernet PCIe
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:0a:00.0
       logical name: enp10s0
       version: 10
       serial: [REMOVED]
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=6.8.0-58-generic firmware=5761-v3.78 latency=0 link=no multicast=yes port=twisted pair
       resources: irq:30 memory:e4110000-e411ffff memory:e4100000-e410ffff

mc@mc-Latitude-E5520:~$ ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: enp10s0:  mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether d0:67:e5:34:4a:16 brd ff:ff:ff:ff:ff:ff
3: wlan0:  mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether a0:88:b4:b2:b8:c0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.40/24 brd 192.168.1.255 scope global dynamic noprefixroute wlan0
       valid_lft 42747sec preferred_lft 42747sec
    inet6 2a01:e0a:b55:b420:2cf2:f8bb:5484:1f9e/64 scope global temporary dynamic 
       valid_lft 86140sec preferred_lft 85723sec
    inet6 2a01:e0a:b55:b420:1f08:4448:2f2f:c436/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 86140sec preferred_lft 86140sec
    inet6 fe80::b80:ca0c:1458:40d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
mc@mc-Latitude-E5520:~$ ip r
default via 192.168.1.254 dev wlan0 proto dhcp src 192.168.1.40 metric 600 
192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.40 metric 600 

mc@mc-Latitude-E5520:~$ sudo  nmcli device
DEVICE   TYPE      STATE                   CONNECTION       
wlan0    wifi      connected               Freebox-5C7A7D 1 
lo       loopback  connected (externally)  lo               
enp10s0  ethernet  unavailable             --               
mc@mc-Latitude-E5520:~$ nmcli con show
NAME                UUID                                  TYPE      DEVICE 
Freebox-5C7A7D 1    7f9fb305-48f8-4547-bf6b-965830a9d664  wifi      wlan0  
lo                  1ad9e920-362a-459e-831d-02e79abba496  loopback  lo     
Freebox-5C7A7D      e78dddb9-7d34-4233-94bb-430b67d424c0  wifi      --     
GLORIOUS EVOLUTION  8cbbc124-2599-4247-b1cc-0fbdd2dd131e  wifi      --     
Maia's Galaxy A12   1ad8128c-afd8-4030-9f60-79a20d719ca6  wifi      --     
Wired connection 1  6bcb00fe-a7d6-3778-bcbf-85def4429cb4  ethernet  --     
mc@mc-Latitude-E5520:~$ sudo nmcli -f all connection 
NAME                UUID                                  TYPE      TIMESTAMP   TIMESTAMP-REAL                    AUTOCONNECT  AUTOCONNECT-PRIORITY  READONLY  DBUS-PATH                                   ACTIVE  DEVICE  STATE      ACTIVE>
Freebox-5C7A7D 1    7f9fb305-48f8-4547-bf6b-965830a9d664  wifi      1746012961  Wed 30 Apr 2025 01:36:01 PM CEST  yes          0                     no        /org/freedesktop/NetworkManager/Settings/4  yes     wlan0   activated  /org/f>
lo                  1ad9e920-362a-459e-831d-02e79abba496  loopback  1746012957  Wed 30 Apr 2025 01:35:57 PM CEST  no           0                     no        /org/freedesktop/NetworkManager/Settings/1  yes     lo      activated  /org/f>
Freebox-5C7A7D      e78dddb9-7d34-4233-94bb-430b67d424c0  wifi      1746010526  Wed 30 Apr 2025 12:55:26 PM CEST  yes          0                     no        /org/freedesktop/NetworkManager/Settings/6  no      --      --         --    >
GLORIOUS EVOLUTION  8cbbc124-2599-4247-b1cc-0fbdd2dd131e  wifi      1735586099  Mon 30 Dec 2024 08:14:59 PM CET   yes          0                     no        /org/freedesktop/NetworkManager/Settings/5  no      --      --         --    >
Maia's Galaxy A12   1ad8128c-afd8-4030-9f60-79a20d719ca6  wifi      1735661656  Tue 31 Dec 2024 05:14:16 PM CET   yes          0                     no        /org/freedesktop/NetworkManager/Settings/2  no      --      --         --    >
Wired connection 1  6bcb00fe-a7d6-3778-bcbf-85def4429cb4  ethernet  0           never                             yes          1                     no        /org/freedesktop/NetworkManager/Settings/3  no      --      --         --    >