Here is the thing...

log_setup_kmod_log() is the function controlling verbocity level. When
called from do_modprobe() execution path, it has a way to control the
"log priority", being able to control how verbose the execution should
be. Meanwhile, when log_setup_kmod_log() is called from do_depmod().. it
has no way to control how verbose the rest of execution will be.

#define DEFAULT_VERBOSE LOG_WARNING
static int verbose = DEFAULT_VERBOSE;

and then:

depmod():
...
case 'v':
  verbose++;
  break;
...
  log_setup_kmod_log(ctx, verbose);
...

since we have:

#define LOG_EMERG       0       /* system is unusable */
#define LOG_ALERT       1       /* action must be taken immediately */
#define LOG_CRIT        2       /* critical conditions */
#define LOG_ERR         3       /* error conditions */
#define LOG_WARNING     4       /* warning conditions */
#define LOG_NOTICE      5       /* normal but significant condition */
#define LOG_INFO        6       /* informational */
#define LOG_DEBUG       7       /* debug-level messages *

Something is bumping the verbose from "warning" into "debug"
automatically.

-- 
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Server, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1864992

Title:
  depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could
  not open builtin file
  '/lib/modules/5.4.0-14-generic/modules.builtin.bin'

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