Package: aptitude Version: 0.8.12-1 Severity: normal while upgrading apt from within aptitude, i got this error:
[...] Setting up libapt-pkg5.0:amd64 (1.8.4) ... (Reading database ... 316101 files and directories currently installed.) Preparing to unpack .../libapt-inst2.0_1.8.4_amd64.deb ... Unpacking libapt-inst2.0:amd64 (1.8.4) over (1.8.3) ... Preparing to unpack .../archives/apt_1.8.4_amd64.deb ... Unpacking apt (1.8.4) over (1.8.3) ... dpkg: error: dpkg frontend lock is locked by another process /etc/cron.daily/apt-compat.dpkg-new /etc/kernel/postinst.d/apt-auto-removal.dpkg-new /etc/apt/apt.conf.d/01autoremove.dpkg-new /etc/logrotate.d/apt.dpkg-new /etc/ld.so.conf.d/zz_i386-biarch-compat.conf.dpkg-new E: Sub-process /usr/bin/dpkg returned an error code (2) dpkg: error: dpkg frontend lock is locked by another process Press Return to continue, 'q' followed by Return to quit. however, immediately trying again (apparently) resolved the issue: Preconfiguring packages ... Setting up apt (1.8.4) ... (Reading database ... 316101 files and directories currently installed.) Preparing to unpack .../apt-utils_1.8.4_amd64.deb ... [...] -- Package-specific info: Terminal: xterm $DISPLAY is set. which aptitude: /usr/bin/aptitude aptitude version information: aptitude 0.8.12 Compiler: g++ 9.2.1 20190821 Compiled against: apt version 5.0.2 NCurses version 6.1 libsigc++ version: 2.10.1 Gtk+ support disabled. Qt support disabled. Current library versions: NCurses version: ncurses 6.1.20190803 cwidget version: 0.5.18 Apt version: 5.0.2 aptitude linkage: linux-vdso.so.1 (0x00007ffd1b0d5000) libapt-pkg.so.5.0 => /usr/lib/x86_64-linux-gnu/libapt-pkg.so.5.0 (0x00007fa6bf1bf000) libncursesw.so.6 => /lib/x86_64-linux-gnu/libncursesw.so.6 (0x00007fa6bf184000) libtinfo.so.6 => /lib/x86_64-linux-gnu/libtinfo.so.6 (0x00007fa6bf154000) libsigc-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libsigc-2.0.so.0 (0x00007fa6bf14b000) libcwidget.so.4 => /usr/lib/x86_64-linux-gnu/libcwidget.so.4 (0x00007fa6bf045000) libsqlite3.so.0 => /usr/lib/x86_64-linux-gnu/libsqlite3.so.0 (0x00007fa6bef21000) libboost_iostreams.so.1.67.0 => /usr/lib/x86_64-linux-gnu/libboost_iostreams.so.1.67.0 (0x00007fa6bef01000) libxapian.so.30 => /usr/lib/x86_64-linux-gnu/libxapian.so.30 (0x00007fa6bece8000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fa6becc7000) libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fa6beaee000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fa6be9a9000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fa6be98f000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa6be7cd000) libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fa6be7b5000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fa6be798000) libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 (0x00007fa6be785000) liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fa6be75c000) liblz4.so.1 => /usr/lib/x86_64-linux-gnu/liblz4.so.1 (0x00007fa6be73d000) libzstd.so.1 => /usr/lib/x86_64-linux-gnu/libzstd.so.1 (0x00007fa6be693000) libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007fa6be668000) libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fa6be5c1000) /lib64/ld-linux-x86-64.so.2 (0x00007fa6bf81b000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fa6be5bc000) librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fa6be5b1000) libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fa6be5a6000) libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007fa6be489000) libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007fa6be466000) -- System Information: Debian Release: bullseye/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.19.0-6-amd64 (SMP w/8 CPU cores) Kernel taint flags: TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=C, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=C (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages aptitude depends on: ii aptitude-common 0.8.12-1 ii libapt-pkg5.0 1.8.4 ii libboost-iostreams1.67.0 1.67.0-13 ii libc6 2.29-2 ii libcwidget4 0.5.18-5 ii libgcc1 1:9.2.1-8 ii libncursesw6 6.1+20190803-1 ii libsigc++-2.0-0v5 2.10.1-2 ii libsqlite3-0 3.29.0-2 ii libstdc++6 9.2.1-8 ii libtinfo6 6.1+20190803-1 ii libxapian30 1.4.12-1 Versions of packages aptitude recommends: ii libparse-debianchangelog-perl 1.2.0-13 ii sensible-utils 0.0.12 Versions of packages aptitude suggests: ii apt-xapian-index 0.50 pn aptitude-doc-en | aptitude-doc <none> pn debtags <none> pn tasksel <none> -- no debconf information