installer failed missing dpkg_1.19.0.4ubuntu1_amd64.deb

[Jb]

Failure with daily:
Lubuntu Daily Alternate 2017 December 04
SHA256 hash of file .\lubuntu-18.04-alternate-amd64.iso:
bd8777489df3159c356879752bbc47e1805e4740d291fe4be6413afba10a6496

Installer fails with:
Warning: Failure trying to run: chroot /target dpkg-deb -f /var/cache/apt/archives/dpkg_1.19.0.4ubuntu1_amd64.deb

I switched to another virtual console with F2 and looked under /target/var/cache/apt and there's no such deb file.

I don't know when this stopped working, but I know the daily on 2017 November 11th worked fine.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1736309

[Jb (jebsolutions)]

Just an update.

The 64bit daily for 2017 December 4 fails.

But the *32bit* daily for 2017 December 4 installs fine.

[Jb (jebsolutions)]

Update #2 for 2017-December 05 isos:
Lubuntu Alternate 64 = fail
Lubuntu Desktop = works
Ubuntu Server = fails

Install breaks due to chroot failing.
Chroot fails because /target/lib64/ld-linux-x86-64.so.2 is not installed on target drive.

Not sure why that file is not copied over.

Lubuntu Alternate failing line:
chroot /target dpkg-deb -f /var/cache/apt/archives/dpkg_1.19.0.4ubuntu1_amd64.deb Version

The chroot error is "no such file or directory", but this is really because of missing /target/lib64/ld-linux-x86-64.so.2

Ubuntu server install halts at:
chroot: can't execute 'dpkg-divert': No such file or directory

If I open another terminal with f2:
cp /lib64/ld-linux-x86-64.so.2 /target/lib64

Then I can manually run the "chroot /target dpkg-deb -f /var/cache/apt/archives/dpkg_1.19.0.4ubuntu1_amd64.deb Version" on Lubuntu alternate without the "No such file or directory" error.

not sure how to debug further.

[Jb (jebsolutions)]

I tried to narrow the time frame where the problem starts:

Ubuntu Server Bionic Daily: 2017 - November 30th = works
Ubuntu Server Bionic Daily: 2017 - December 04th = fails

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jb (jebsolutions)]

Can someone please try setting this environment variable to the install script and rebuilding the iso:

EXTRACT_UNSAFE_SYMLINKS=1

Why? Both "ar" and "tar" link to busybox. Busybox had a recent tar overwrite default change.

[Jb (jebsolutions)]

Lubuntu Alternate Workaround

... work around..

Basically...you manually replace tar symlink to busybox with real tar

On working *17.10* (18.04's closest relative) system do this BEFORE installing 18.04...

[replace /somewhere with ...a network share]

ldd /bin/tar

 linux-vdso.so.1 (ignore this one)
 cp /lib/x86_64-linux-gnu/libacl.so.1 /somewhere
 cp /lib/x86_64-linux-gnu/libselinux.so.1 /somewhere
 cp /lib/x86_64-linux-gnu/libc.so.6 /somewhere
 cp /lib/x86_64-linux-gnu/libattr.so.1 /somewhere
 cp /lib/x86_64-linux-gnu/libpcre.so.3 /somewhere
 cp /lib/x86_64-linux-gnu/libdl.so.2 /somewhere
 cp /lib/x86_64-linux-gnu/libpthread.so.0 /somewhere
 cp /bin/tar /somewhere

Also copy /somewhere/fix.sh (see end of this message)

Okay...so now /somewhere (i used a network share) has all the .so files and the binaries for tar.

Now boot the regular 18.04 Lubuntu Alternate iso.

When it bombs out Alt-F2 to switch to second console.

Mount /somewhere (I used network share)
mkdir /somewhere
mount -t cifs -ousername=whatever,password=whatever //server/share /somewhere
/somewhere/fix.sh

... script will silently setup everything...

switch back to main console. Control-Alt-f1.

Hit enter about 5 times to ignore errors and then retry the install...works. :)

also copy this script to /somewhere/fix.sh
------------------------------------------
#!/bin/sh
# copy files
cp /somewhere/libacl.so.1 /lib/x86_64-linux-gnu
cp /somewhere/libselinux.so.1 /lib/x86_64-linux-gnu
cp /somewhere/libc.so.6 /lib/x86_64-linux-gnu
cp /somewhere/libattr.so.1 /lib/x86_64-linux-gnu
cp /somewhere/libpcre.so.3 /lib/x86_64-linux-gnu
cp /somewhere/libdl.so.2 /lib/x86_64-linux-gnu
cp /somewhere/libpthread.so.0 /lib/x86_64-linux-gnu

cp /somewhere/libbfd-2.29.1-system.so /usr/lib/x86_64-linux-gnu/
#cp /somewhere/libc.so.6 /lib/x86_64-linux-gnu/
cp /somewhere/libz.so.1 /lib/x86_64-linux-gnu/
cp /somewhere/libdl.so.2 /lib/x86_64-linux-gnu/

# break symlink to ar and replace with real ar
#rm -rf /usr/bin/ar
#cp /somewhere/ar /usr/bin/arcopy
#
#cat <<"EOM_AR" > /bin/ar
##!/bin/sh
#echo $0 $* >> /test.log
#export EXTRACT_UNSAFE_SYMLINKS=1
#/usr/bin/arcopy $*
#EOM_AR
#
#chmod a+x /usr/bin/ar

#ar part works isn't needed

# break symlink to tar and replace with real tar + overwrite
rm -rf /bin/tar
cp /somewhere/tar /bin/tarcopy

cat <<"EOM_TAR" > /bin/tar
#!/bin/sh
echo $0 $* >> /test.log
if [ "$1" = "-k" ]; then
    /bin/tarcopy --overwrite $2 $3 $4 $5 $6 $7 $8 $9
else
 /bin/tarcopy $*
fi

EOM_TAR

chmod a+x /bin/tar

# fix existing /target/dev/* breaking reinstall attempt
rm -rf /target/dev*