libpcap, не находит ни одного устройства

#include <pcap.h>
int main()
{
    pcap_if_t *alldevs;
    pcap_if_t *d;
    int i=0;
    char errbuf[PCAP_ERRBUF_SIZE];
    /* Retrieve the device list from the local machine */
    if (pcap_findalldevs(&alldevs, errbuf) == -1)
    {
        fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
        return -1;
    }
    fprintf(stderr, "%s\n", errbuf);
    
    /* Print the list */
    for(d= alldevs; d != NULL; d= d->next)
    {
        printf("%d. %s", ++i, d->name);
        if (d->description)
            printf(" (%s)\n", d->description);
        else
            printf(" (No description available)\n");
    }
    if (i == 0)
    {
        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
        return -1;
    }
    /* We don't need any more the device list. Free it */
    pcap_freealldevs(alldevs);
    return 0;
}

usbmon5: Can't open USB bus file /sys/kernel/debug/usbmon/5t: No such file or directory