Package: libgnutls30 Version: 3.7.0-5 Same issue here, I rarely need FTP so it's a chance to see this bug report here since I wasn't sure of the track..
My problem happens while trying to connect on a FTP server running Cerberus FTP (Windows). It doesn't seem to happen on the other FTP servers I have in my list. Also tried with lftp and gftp, same error messages than OP. -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 5.10.0-1-amd64 (SMP w/4 CPU threads) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) Versions of packages libgnutls30 depends on: ii libc6 2.31-9 ii libgmp10 2:6.2.1+dfsg-1 ii libhogweed6 3.6-2 ii libidn2-0 2.3.0-4 ii libnettle8 3.6-2 ii libp11-kit0 0.23.22-1 ii libtasn1-6 4.16.0-2 ii libunistring2 0.9.10-4 libgnutls30 recommends no packages. Versions of packages libgnutls30 suggests: pn gnutls-bin <none> -- debconf-show failed