[Bug 1818285] Re: [disco desktop] Installation fails with parted_server: No data in infifo. parted_server: Line 2387. CRITICAL ERROR!!! EXITING.

[Jean-Baptiste Lallement]

A diff of the symbol tables of both builds of parted_server shows that
the symbols for sscanf and fscanf are different

$ diff -u <(nm -D 19.04.5/parted_server) <(nm -D 19.04.6/parted_server)
--- /dev/fd/63  2019-03-04 09:24:40.172170149 +0100
+++ /dev/fd/62  2019-03-04 09:24:40.172170149 +0100
@@ -22,7 +22,6 @@
                  U fputs
                  U free
                  U freopen
-                 U fscanf
                  U getenv
                  U getpid
                  U getppid
@@ -31,6 +30,8 @@
 0000000000015170 B infifo
 0000000000015090 D infifo_name
 0000000000011000 R _IO_stdin_used
+                 U __isoc99_fscanf
+                 U __isoc99_sscanf
                  w _ITM_deregisterTMCloneTable
                  w _ITM_registerTMCloneTable
                  U kill
@@ -118,7 +119,6 @@
                  U sigaction
                  U sigemptyset
                  U sleep
-                 U sscanf
                  U __stack_chk_fail
 0000000000015140 B stderr
 0000000000015050 D stopfifo_name

This bug could be due to a new version of gcc used to build
parted_server.

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https://bugs.launchpad.net/bugs/1818285

Title:
  [disco desktop] Installation fails with parted_server: No data in
  infifo.  parted_server: Line 2387. CRITICAL ERROR!!!  EXITING.

Status in partman-base package in Ubuntu:
  Confirmed
Status in partman-base source package in Disco:
  Confirmed

Bug description:
  Ubuntu Desktop Disco amd64

  Last known good version: ubiquity 19.04.5

  Automated preseeded tests of Ubuntu Desktop Disco, started failing on
  Feb. 4th with this error in partman log:

  /bin/partman: *******************************************************
  /lib/partman/init.d/30parted: *******************************************************
  parted_server: ======= Starting the server
  parted_server: main_loop: iteration 1
  parted_server: Opening infifo
  /lib/partman/init.d/30parted: IN: OPEN =dev=vda /dev/vda
  parted_server: No data in infifo.
  parted_server: Line 2387. CRITICAL ERROR!!!  EXITING.

  /var/log/ and journal attached to this report.

  Maybe it's a coincidence but it started after the upload of partman-
  crypto.

  Manual installation with Ubiquity fails too with the same error.

  Test Case:
  1. Boot to the live session
  2. Launch Ubiquity
  3. Press 'Next' on all the steps keeping the default

  Actual Result:
  You cannot go beyond the 'Updates and Other software' page.

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