制作ubuntu18.04的rootfs.img时候，执行apt upgrade命令报错一下错误：
E: Can not write log (Is /dev/pts mounted?) - posix_openpt (19: No such device)
(Reading database ... 4037 files and directories currently installed.)
Preparing to unpack .../libc6_2.27-3ubuntu1.4_arm64.deb ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/aarch64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/aarch64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/aarch64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/aarch64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)
debconf: falling back to frontend: Teletype
dpkg: error processing archive /var/cache/apt/archives/libc6_2.27-3ubuntu1.4_arm64.deb (--unpack):
new libc6:arm64 package pre-installation script subprocess returned error exit status 2
Errors were encountered while processing:
/var/cache/apt/archives/libc6_2.27-3ubuntu1.4_arm64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)